PHY Final exam

A positive charge of 7.45513E-4 C is 27 m from a negative charge of 1.14445E-4 C. What is the force of one of the charges due to the other charge in units of Newtons?

-1.1

A positive charge of 4.53497E-4 C is 15 m from a negative charge of 1.48124E-4 C. What is the force of one of the charges due to the other charge in units of Newtons?

-2.7

An electron in the ground state of an atom has an energy of -47.4 eV. What is the energy of the third excited state? Give your answer in eV, and round to 1 decimal place.

-3

An electron in the ground state of an atom has an energy of -50.5 eV. What is the energy of the third excited state? Give your answer in eV, and round to 1 decimal place.

-3.2

How much work in Joules must be done by frictional forces in slowing a 1471 kg car from 23 m/s to rest? Round your answer to 1 decimal place.

-389079.5

An electron in second excited state of an atom has an energy of -6 eV. What is the energy of the ground state? Give your answer in eV, and round to 1 decimal place.

-54

An electron in second excited state of an atom has an energy of -6.4 eV. What is the energy of the ground state? Give your answer in eV, and round to 1 decimal place.

-57.6

How much work in Joules must be done by frictional forces in slowing a 1376 kg car from 30 m/s to rest? Round your answer to 1 decimal place.

-619200

GRAPH HW 2 In the attached graph, the acceleration of the object between 0 and 5 seconds is

.8 m/s/s.

A water wave passes a boat every 17 seconds. What is the frequency of the waves in Hz? Round your answer to 2 decimal places.

0.06

A set of waves has a frequency of 38 Hz and a speed of 8 m/s. What is the wavelength of the waves in meters?

0.2

A transformer has 119 loops in the the primary coil and 367 loops in the secondary coil. If the input current is 2.1 A, what is the output current of the transformer in Amps?

0.7

The image formed by a concave mirror is 75 cm tall. If the object was 42 cm tall, what is the magnification? Round your answer to 1 decimal place.

1.8

The gravitational acceleration on the moon is 1/6 of that on Earth. If an object weighs 60 N on earth, what is it's weight in Newton's on the moon? Round your answer to 1 decimal place

10

The gravitational acceleration on the moon is 1/6 of that on Earth. If an object weighs 70 N on earth, what is it's weight in Newton's on the moon? Round your answer to 1 decimal place

11.7

You push on a refrigerator with a force of 20 N and cause the refrigerator to accelerate at 1.7 m/s/s. What is the refrigerator's mass in kg?

11.8

Your friend who is 118 cm tall stands 8 m in front of a plane mirror. What height is the image that she sees in cm? Round your answer to the nearest whole number.

118

A friend from Europe is visiting you and sees the weather forecast on TV. The forecast is for a high temperature of 56 degrees Fahrenheit, and your friend asks you what this temperature is in Celcius. What do you tell her? Round your answer to 1 decimal place.

13.3

A positive charge of 0.0004C is 9.1 m from a negative charge of 0.003 C. What is the force of one of the charges due to the other charge in units of Newtons?

130.4 Test 3 b #30

If electric energy costs 12 cents per kwh, how many cents does it cost to keep a 1547 W toaster running for 44 minutes? Round your answer to a whole number of cents.

14 (13.55)

If 8.9 x 10^16 electrons pass a particular point in a wire every second, what is the current in the wire in milli-Amps?

14.2

If 89 x 10^16 electrons pass a particular point in a wire every second, what is the current in the wire in milli-Amps?

142.4 test 3b #40

In the absence of friction, how much work in Joules would a child do while pulling a 2.5 kg wagon a distance of 24 m with a 6 N force? Round your answer to 1 decimal place.

144

A transformer has an output current of 2 A and an input current of 2 A. If the input coil has 150 loops, how many loops are in the output coil?

150

A 12 kg box is resting on a table 1.3 m above the ground. What is the box's potential energy in Joules? Round your answer to 1 decimal place.

152.9

Your friend tells you that she has discovered a new element with atomic number 155. How many electrons are in the new element?

155

Your friend tells you that she has discovered a new element with atomic number 170. How many electrons are in the new element?

170

A 3.6-ohm resistor has a 5-A current in it. What is the voltage across the resistor?

18 Test 3-B #9

According to the special theory of relativity, how much energy in Joules is in 0.002 micrograms of dust?

180000

A 1214 kg car accelerates at a rate of 10 m/s/s over a distance of 155 m. What is the work done in Joules to accelerate the car? Round your answer to 1 decimal place.

1881700

A refrigerator is pushed a distance of 8 m with a force of 24 N. How much work in Joules is done on the set? Round your answer to 1 decimal place.

192

Light traveling in glass (n=1.5) is incident on an air/glass interface at an incident angle of 32 degrees. If the refracted angle is 23 degrees, what is the index of refraction of the glass?

2.1

A 13 kg ball has a momentum of 31.7 kg m/s. The ball's speed is

2.4

A light ray in air is incident on an unknown substance with an incidence angle of 36 degrees. If the light ray is refracted at an angle 13 degrees in the substance, what is the index of refraction of the substance? Round your answer to 1 decimal place.

2.6

A friend from Europe is visiting you and sees the weather forecast on TV. the forecast is for high temperature of 37 degrees Fahrenheit and your friend ask you what the temperature is in Celsius what do you tell her?

2.8

A friend from Europe is visiting you and sees the weather forecast on TV. The forecast is for a high temperature of 68 degrees Fahrenheit, and your friend asks you what this temperature is in Celcius. What do you tell her? Round your answer to 1 decimal place.

20

If electric energy costs 12 cents per kwh, how many cents does it cost to keep a 2725 W toaster running for 36 minutes? Round your answer to a whole number of cents.

20 (19.62)

It takes 6.4 seconds for a stone that is dropped from rest to fall to the bottom of a mine shaft. The depth of the mine shaft is

200.7 m. Round your answer to 1 decimal place.

A 17 kg box is resting on a table 1.4 m above the ground. What is the box's potential energy in Joules? Round your answer to 1 decimal place.

233.2

The freezing point of water in the kelvin scale is

237K

A bullet is fired horizontally with an initial velocity of 108 m/s from a tower 24 m high. If air resistance is negligible, what is the horizontal distance the bullet travels before hitting the ground?

239.019

You do 184.9 J of work in 7.6 s. What is your power output in W? 24.3 Round your answer to 1 decimal place.

24.3

A red car has a speed of 33 m/s, and a kinetic energy of 637 J. An identical blue car has twice the speed of the red car. What is the blue car's kinetic energy in Joules? Round your answer to 1 decimal place.

2548

A power line with a resistance of 3.6 ohms has a current of 27 A in it. The power dissipated in the line in watts is

2624.2 Test 3b #16

A freezing point of water in the Kelvin scale is

273 K

A 2.9 kg mass at the Earth's surface weighs 28.4 N. Round your answer to one decimal place.

28.4

A gun with a muzzle velocity of 74 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange in meters will the bullet be 3.8 seconds later? Round your answer to 1 decimal place.

281.2

A red car has a speed of 17 m/s, and a kinetic energy of 706 J. An identical blue car has twice the speed of the red car. What is the blue car's kinetic energy in Joules? Round your answer to 1 decimal place.

2824

The temperature in January in Winnipeg, Manitoba, has been known to go down to -1.5 degrees C. What is the temperature on the Fahrenheit Scale

29.3 test 3b #38

A bullet is fired horizontally with an initial velocity of 125.7 m/s from a tower 27 m high. If air resistance is negligible, what is the horizontal distance the bullet travels before hitting the ground?

295.066

A ball is moving at 8.8 m/s and has a momentum of 30.4 kg m/s. What is the ball's mass in kg?

3.5

You do 257.6 J of work in 8.6 s. What is your power output in W? 30.0 Round your answer to 1 decimal place.

30

A gun with a muzzle velocity of 68.4 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange in meters will the bullet be 4.5 seconds later? Round your answer to 1 decimal place.

307.8

A 1045 kg car accelerates at a rate of 6 m/s/s over a distance of 498 m. What is the work done in Joules to accelerate the car? Round your answer to 1 decimal place.

3122460

The highest temperature ever recorded in the United States is 134 degrees F. What is this temperature in kelvins? Round your answer to 1 decimal place.

329.7

A potential difference of 104 volts produces a current of 3 amps in the heating element of a toaster. What is the resistance of the toaster in Ohms? Round your answer to 1 decimal place.

34.7

Charges Q1 and Q2 exert repulsive forces of 20 N on each other. What is the repulsive force in Newtons when their separation is decreased so that their final separation is 74 % of their initial separation?

36.5

Charges Q1 and Q2 exert repulsive forces of 19 N on each other. What is the repulsive force in Newtons when their separation is decreased so that their final separation is 72 % of their initial separation?

36.7

If a rocket initially at rest accelerates at a rate of 50.3 m/s/s for 7.3 seconds, its speed will be

367.19 m/s. Round your answer to one decimal place.

If a rocket initially at rest accelerates at a rate of 51.8 m/s/s for 7.3 seconds, its speed will be

378.14 m/s. Round your answer to one decimal place.

You push on a refrigerator with a force of 11 N and cause the refrigerator to accelerate at 2.6 m/s/s. What is the refrigerator's mass in kg?

4.2

A 8.5 kg ball has a momentum of 36.6 kg m/s. The ball's speed is

4.3

waves on the surface of a pond are observed to have a wavelength of 3 m and a speed of 13 m/s. What is the frequency of the wave motion in hertz?

4.3

A 779 kg car moving at 38 m/s brakes to a stop in 7 s. What is the magnitude of braking force in Newtons?

4228.9

The ground state energy of an electron in an atom is -47.7 eV. When an electron transitions from orbit number 4 to the ground state, how much energy is given off? Give your answer in eV and round to 1 decimal place.

44.7 (SHOULD BE POSITIVE)

A current of 3.6 A passes through a lamp with a resistance of 3.6 Ohms. What is the power supplied to the lamp in Watts?

46.7 tes 3b #35

The orbital radius of the 3rd excited state of an atom is 22.1 angstroms. What is the orbital radius of orbit number 6 in angstroms? Round your answer to 1 decimal place.

49.7

How many protons are in a boron atom?

5

A 64 kg woman riding a bicycle has a speed of 10 m/s at the bottom of the hill. As she travels up the hill, she does not pedal, and gradually coasts to a stop. How far in meters (vertically) above the bottom of the hill is she when she stops? Round your answer to 1 decimal place.

5.1

A motor lifts a mass M a height of 15 m in a time of 5.1 s. If the power output of the motor is 148 W, what is the mass in kg?

5.1

A ball is moving at 6.5 m/s and has a momentum of 34 kg m/s. What is the ball's mass in kg?

5.2

An olympic sprinter can run 97 yards in 8 seconds. At the same rate, how long (in seconds) would it take the sprinter to run 63 m? Round your answer to one decimal placE

5.7

Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 seconds. The power needed to do this job was

50 W test 3 b #22

A refrigerator is pushed a distance of 15 m with a force of 34 N. How much work in Joules is done on the set? Round your answer to 1 decimal place.

510

Using 889 J of work, a toy elevator is raised from the ground floor to the second floor in 17.1 seconds. The power needed to do this job was

52.0

What is the power in Watts required to exert a 37N force over 10 m in 7 s?

52.9 Test 3b #21

If 34 x 10^16 electrons pass a particular point in a wire every second, what is the current in the wire in milli amps?

54.4 Test 3 Version A #40

A student drops a ball from the top of a tall building, and it takes 3.4 seconds for the ball to reach the ground. What is the height of the building in meters? Round your answer to one decimal place

56.6

A 873 kg car moving at 33 m/s brakes to a stop in 5 s. What is the magnitude of braking force in Newtons?

5761.8

A current of 1.1 A passes through a lamp with a resistance of 5 Ohms. What is the power supplied to the lamp in Watts?

6.05

Approximately how many neutrons are in Ag-108?

61

A student drops a ball from the top of a tall building, and it takes 3.6 seconds for the ball to reach the ground. What is the height of the building in meters?

63.5

According to the special theory of relativity, how much energy in Joules is in 0.007 micrograms of dust?

630000

The orbital radius of the 3rd excited state of an atom is 22.8 angstroms. What is the orbital radius of orbit number 7 in angstroms? Round your answer to 1 decimal place.

69.8

A radioactive nucleus with atomic number 6 decays by emitting an electron. What is the nucleus's atomic number after it decays?

7

A 64 kg woman riding a bicycle has a speed of 12 m/s at the bottom of the hill. As she travels up the hill, she does not pedal, and gradually coasts to a stop. How far in meters (vertically) above the bottom of the hill is she when she stops? Round your answer to 1 decimal place.

7.3

Using 1126 J of work, a toy elevator is raised from the ground floor to the second floor in 15.8 seconds. The power needed to do this job was

71.3

In the absence of friction, how much work in Joules would a child do while pulling a 2.9 kg wagon a distance of 8 m with a 9 N force? Round your answer to 1 decimal place.

72

It takes 4 seconds for a stone that is dropped from rest to fall to the bottom of a mine shaft. The depth of the mine shaft is

78.4 m. Round your answer to 1 decimal place.

A potential difference of 158 volts produces a current of 2 amps in the heating element of a toaster. What is the resistance of the toaster in Ohms? Round your answer to 1 decimal place.

79

A radioactive nucleus with atomic number 7 decays by emitting an electron. What is the nucleus's atomic number after it decays?

8

A motor lifts a mass M a height of 13 m in a time of 6.3 s. If the power output of the motor is 166 W, what is the mass in kg?

8.2

The frequency of an electromagnetic wave is 35831 Hz. What is the wavelength of the light in meters? Round your answer to 1 decimal place.

8372.6

A 9.1 kg mass at the Earth's surface weighs

89.2

If 5.9 x 10^16 electrons pass a particular point in a wire every second, what is the current in the wire in milli-Amps?

9.4

An olympic sprinter can run 63 yards in 8.8 seconds. At the same rate, how long (in seconds) would it take the sprinter to run 65 m? Round your answer to one decimal place.

9.9

A U-235 atom decays by alpha emission. What is the atomic number of the element after decay?

90

A ball can be rolled down one of three different ramps, as shown below. The final elevation loss of each of the ramps is the same. Neglecting friction, for which ramp will the speed of the ball be the highest at the bottom? A. The speed of the ball will be the same for all ramps. B. The speed of the ball will be the same for ramps X and Y, but less for ramp Z. C. Ramp X D. Ramp Y E. Ramp Z (Graph in hw 5)

A

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is A. zero. B. 10 km/hr. C. 110 km/hr. D. 1000 km/hr. E. 625 km/hr.

A

A concave spherical mirror has a radius of curvature of 50 cm. The image of an object located 35 cm in front of the mirror is A. real, inverted B. real, upright C. virtual, upright D. virtual, inverted

A

A good heat conductor is A. a poor insulator. B. a good insulator. C. neither a poor nor a good insulator. D. both a good insulator and a poor insulator. E. very dense.

A

A hockey puck is set in motion across a frozen pond. If friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is A. zero. B. equal to its weight. C. equal to its weight divided by its mass. D. equal to the product of its mass times its weight. E. equal to its mass.

A

A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves? A. 3 m/s B. 5 m/s C. 15 m/s D. 45 m/s

A

A stone is thrown horizontally from the top of a cliff. One second after it has left your hand, its vertical distance below the top of the cliff is A. 5 m. B. 10 m. C. 15 m. D. 20 m. E. none of the above.

A

A woman runs up a flight of stairs. The gain in her gravitational potential energy is 100 J. If she runs up the same stairs with twice the speed, what is her gain in potential energy? A. 100 J B. 200 J C. 50 J D. 400 J E. 25 J

A

Aluminum has a specific heat capacity more than twice that of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be A. copper. B. aluminum. C. both the same.

A

An electric motor is very similar to A. an electric generator. B. an automobile battery. C. a radio receiver. D. None of the above choices are correct.

A

An element will decay to an element with higher atomic number in the periodic table if it emits A. a beta particle. B. a gamma ray. C. a proton. D. an alpha particle. E. none of these

A

An object that completes 10 vibrations in 20 seconds has a frequency of A. 0.5 hertz. B. 2 hertz. C. 100 hertz D. 200 hertz.

A

An object that completes 100 vibrations in 5 seconds has a period of A. 0.05 second. B. 1 second. C. 2 seconds. D. 20 seconds.

A

As light passes from one medium into another, the angle of refraction is _____ in the medium with the ___ index of refraction and ____ speed of light. A. smaller, larger, lower B. smaller, larger, higher C. larger, smaller, lower D. larger, larger, lower E. smaller, smaller, higher

A

GRAPH HW 1 What is the y-intercept of the graph? A. 10 m B. 70 m C. 3 m D. -3 m

A

If the frequency of a certain wave is 10 hertz, its period is A. 0.1 second. B. 10 seconds. C. 100 seconds. D. None of the above choices are correct.

A

If you push an object a given distance, while applying twice the force, you do A. twice as much work. B. four times as much work. C. the same amount of work. D. half as much work.

A

If you push an object twice as far while applying the same force, you do A. twice as much work. B. four times as much work. C. the same amount of work. D. half as much work.

A

If you push for a half hour or a whole hour against a stationary wall A. no work on the wall is done in either case. B. half as much work is done during the half hour. C. twice as much work is done during the half hour. D. it is impossible to determine how much work is done.

A

In the periodic table, elements in the same ______ have very similar properties. A. column B. row C. nucleus D. ion E. color

A

Like kinds of magnetic poles repel while unlike kinds of magnetic poles A. attract. B. repel also. C. may attract or repel. D. neither repel or attract

A

Padded dashboards in cars are safer in an accident than nonpadded ones because an occupant hitting the dash has A. increased time of impact. B. decreased time of impact. C. decreased impulse. D. increased momentum.

A

The Bohr model of the atom is akin to a A. miniature solar system. B. blob of plum pudding, where raisins represent atomic nuclei. C. central heavy ball with lighter balls connected by springs. D. all of these

A

The fact that desert sand is very hot in the day and very cold at night is evidence that sand has A. a low specific heat. B. a high specific heat. C. no specific heat.

A

The shortest plane mirror in which you can see your entire image is A. half your height. B. about 3/4 your height. C. about 1/3 your height. D. equal to your height. E. dependent on your distance from the mirror.

A

The weight of objects on the moon is 1/6 of their weight on earth. A golf ball moving with speed v on the moon has kinetic energy equal to __________________ it would have if it was moving at the same speed on earth. A. the kinetic energy B. 1/36 the kinetic energy C. 1/6 the kinetic energy D. 6 times the kinetic energy E. 36 times the kinetic energy

A

True or False: You throw a 5.0 kg stone from the top of a cliff with an initial vertical velocity of 8.0 m/s downward and an initial horizontal velocity of 7.0 m/s away from the cliff, and it feels no air resistance. After the stone is in the air but free of your hand, its acceleration remains constant at 9.8 m/s/s downward but its speed changes.

A

What is the approximate wavelength of violet light? A. 400 nm B. 500 nm C. 600 nm D. 700 nm E. 800 nm

A

What is the lowest energy level in an atom called? A. The ground state. B. The floor state. C. The basement state. D. The first state. E. The first excited state.

A

When a nucleus emits a beta particle, its atomic number A. increases by 1. B. decreases by 1. C. increases by 2. D. decreases by 2. E. none of these

A

When you stand in water up to your knees, your feet appear A. closer than usual. B. farther away than usual. C. at the same location as usual. D. To answer, you must know the depth of the water. E. To answer, you must know the index of refraction of the water.

A

Which astronomer was the first to put the sun at the center of the universe? A. Copernicus B. Brahe C. Ptolemy D. Galileo

A

Which element is most abundant in stars? A. hydrogen B. helium C. iron D. carbon

A

Which of the following is not a transverse wave? A. sound B. visible light C. radio wave D. all of these E. none of these

A

Which of the following statements is Newton's 2nd law? A. Force equals mass times acceleration. B. Objects in motion will stay in motion and objects at rest will stay at rest unless acted upon by an outside force. C. For every action there is an equal and opposite reaction. D. There is an attractive force between any 2 objects in the universe.

A

Which statement is correct? A. Charge flows in a closed circuit. B. Voltage flows through an open or a closed circuit. C. Resistance flows through an open circuit. D. Current is the primary cause of voltage. E. Charge flows in either an open or closed circuit.

A

While an object near the Earth's surface is in free fall, its A. velocity increases. B. acceleration increases. C. mass increases. D. mass decreases. E. velocity is constant.

A

Why are there bright and dark fringes on the screen in the double-slit experiment? A. The light from the two slits travels different distances. B. The light from the two slits is a different color. C. The light from the two slits is a different frequency. D. The light shone on the two slits are different intensities.

A

If you push an object a given distance, while applying twice the force, you do a) twice as much work b) four times as much work c) the same amount of work d) half as much work

A -twice as much work

The temperature in January in Winnipeg, Manitoba, has been known to go down to -7.5 degrees C. What is the temperature on the Fahrenheit Scale A 18.5 B -10.3 C -13.6 D 71.1 E -265.5

A 18.5 Test 3 Version A 38

A car accelerates from rest for 10 seconds until it reaches a speed of 74 m/s. What is the cars acceleration in meters per second per second? A 7.4 B 0.1 C 0 D 0.74 E 740

A 7.4 a = vf - vi -------- t a = 74 - 0 -------- 10

A car accelerate from rest for 4 sec until it reaches a speed of 35 m/s. What is the car's acceleration in meters per second per second? A 8.8 B 0.1 C 0 D 2.19 E 140

A 8.8 a= vf-vi ------ t 35-0 ------ 4

Which of the following is a government research lab? A Argonne National Lab B Bell Laboratories C Carnegie Institution D Woods Hole Oceanographic Institution

A Argonne National Lab

The electrical force between charges is strongest when the charges are A close together b far apart c the electrical forces constant everywhere D opposite signs the same signs

A close together

In which part of the sun does most fusion take place? A core B photoshphere C chromosphere D corona E radiation zone

A core

When you touch a cold piece of ice with your finger, energy A flows from your finger to the ice B flows from the ice to your finger C flows both ways D doesn't flow

A flows from your finger to the ice

As a system becomes more disordered, entropy A increases B decreases C remains the same d goes to zero

A increases

Stars that have ___ mass than the sun will end their lives as neutron stars A more B Less C the same

A more

The SI unit of force is the A newton B gram C pound D kilogram E meters per second squared

A newton

A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? A the dropped one B the fired one C both hit at the same time D not enough information to determine

A the dropped one

Two charged particles attract each other with a force F. If the charges of both particles are doubled, and the distance between them are also doubled, in the force of attraction will be A the same B twice as large C half as much D 1/4 as much E none of these

A the same

Which of the following is Kepler's second law? A. A line from the Sun to the Earth sweeps out equal areas in equal time B. Planets move in elliptical orbits the Sun at one Focus C. The square of the period of the orbit is proportional to the cube of the orbital radius D. For every action there is an equal and opposite reaction

A. A line from the Sun to the Earth sweeps out equal areas in equal time

While an object near earths surface is in free fall, its a. velocity increases b. acceleration increases c. mass increases d. mass decreases e. velocity is constant

A. Velocity increases

If you push for a half hour or a whole hour against a stationary wall A. no work on the wall is done either case B. half as much work is done during the half-hour C. twice as much work is done during the half-hour D. It is impossible to determine how much work is done

A. no work on the wall is done either case

The weight of objects on the moon is 1/6 of their weight on earth. A golf ball moving with speed v on the moon has kinetic equal to _____ it would have if it was moving at the same speed on earth. A. the kinetic energy B. 1/36 the kinetic energy C. 1/6 the kinetic energy D. 6 times the kinetic energy

A. the kinetic energy

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is A. 1000 N. B. 2000 N. C. 3000 N. D. 4000 N. E. 5000 N.

B

A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is A. 30 hertz and it travels at 60 m/s. B. 60 hertz and it travels at 30 m/s. C. 1800 hertz and it travels at 2 m/s. D. 30 hertz and it travels at 30 m/s E. 60 hertz and it travels at 60 m/s

B

A device that transforms electrical energy to mechanical energy is a A. generator. B. motor. C. transformer. D. magnet. E. none of these

B

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its horizontal component of velocity A. increases. B. remains unchanged. C. decreases. D. depends on the mass of the rock.

B

A straight bar magnet is initially 4 cm long, with the north pole on the right and the south pole on the left. If you cut the magnet in half, the right half will A. only contain a north pole. B. still contain a north pole on the right and a new south pole on the left. C. only contain a south pole. D. contain a south pole on the right and a north pole on the left.

B

A temperature difference of 10 degrees Celsius is also equal to a temperature difference of 10 on the A. Fahrenheit scale. B. Kelvin scale. C. Joule scale. D. all of these. E. none of these

B

An 80 kg man on ice skates pushes a 40 kg boy, also on skates, with a force of 100 N. The force exerted by the boy on the man is A. 200 N B. 100 N C. 50 N D. 40 N E. zero unless the boy pushes back.

B

An astronaut, floating alone in outer space, throws a baseball. If the ball floats away at a speed of 20 meters per second, the astronaut will A. move in the opposite direction at a speed of 20 m/s. B. move in the opposite direction, but at a lower speed. C. move in the opposite direction but at a higher speed. D. stay still. E. move in the same direction as the baseball.

B

At the end of the semester, when calculating your grade, how many test scores will be dropped? A. 0 B. 1 C. 2 D. 3

B

Clocks on a spaceship moving very fast relative to the Earth run more slowly when viewed from A. the spaceship. B. the Earth. C. both places. D. neither place.

B

Compared to ultraviolet waves, the wavelength of infrared waves is A. shorter. B. longer. C. the same.

B

Convert 20 mph into m/s. A. 32180 m/s B. 8.9 m/s C. 89 m/s D. 536 m/s

B

Convert 50 mph into m/s. A. 8045 m/s B. 22.3 m/s C. 2.23 m/s D. 0.23 m/s

B

Do 100 J of work in 50 s and your power output is A. 1/2 W B. 2 W. C. 4 W. D. 50 W. E. 5,000 W.

B

During a single period, the distance traveled by a wave is A. one-half wavelength. B. one wavelength. C. two wavelengths. D. four wavelengths.

B

How many vibrations per second are associated with a 101-MHz radio wave? A. less than 101,000,000 B. 101,000,000 C. more than 101,000,000

B

If a ball is released from rest at x = 6 m, what is the location of the other turning point? A. 10 m B. 14 m C. 2 m D. 8 m E. 12 m Graph in hw 5

B

If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is A. 3 km/h/s. B. 6 km/h/s. C. 10 km/h/s. D. 60 km/h/s. E. 600 km/h/s.

B

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about A. 5 m/s. B. 10 m/s. C. 15 m/s. D. a variable amount. E. depends on its initial speed

B

If an alpha particle and a beta particle have the same energy, which particle will penetrate farther into an object? A. alpha particle B. beta particle C. They both penetrate the same distance. D. It depends on what atom they decayed from.

B

If an object is raised twice as high, its potential energy will be A. half as much B. twice as much. C. four times as much. D. impossible to determine unless the time is given. E. impossible to determine unless the mass is given

B

If an object moves with constant acceleration, its velocity must A. be constant also. B. change by the same amount each second. C. change by varying amounts depending on its speed. D. always decrease.

B

In the SI unit system, distance is measured in units of A. miles B. meters C. kilometers D. feet

B

In your house, most heat is lost through the process of A. Heat B. Conduction C. Convection D. Radiation E. Temperature

B

The Chandra Telescope measures _____ light. A. ultraviolet B. x-ray C. microwave D. radio wave

B

The Hubble Space Telescope measures _____ light. A. x-ray B. visible C. microwave D. radio wave

B

The freezing point of water in the Celcius scale is A. - 273 degrees C. B. 0 degrees C. C. 32 degrees C. D. 100 degrees C. E. 212 degrees C.

B

The index of refraction of a substance is 1.8. What is the speed of light in this substance? A. 3 x 10^8 m/s B. 1.67 x 10^8 m/s C. 4.9 x 10^8 m/s D. 1.84 x 10^8 m/s E. 1.62 x 10^8 m/s

B

The lowest temperature possible in nature is A. 0 degrees C. B. -273 degrees C. C. 4 K. D. 32 degrees C. E. 100 K

B

The periodic table is ordered by A. atomic mass. B. atomic number. C. neutron number. D. color of element. E. year of element's discovery.

B

The process by which scientists publish their results is the ______ process. A. trial and error B. peer review C. good 'ol boy D. government

B

The slope of a position vs. time graph tells you the A. position B. velocity C. acceleration D. maximum position E. time

B

The vibrations of a transverse wave move in a direction A. along the direction of wave travel. B. at right angles to the direction of wave travel. C. that changes with speed. D. opposite to the velocity.

B

To see his full height, a boy that is 1 meter tall needs a mirror that is at least A. 0.33 m tall. B. 0.50 m tall. C. 0.75 m tall. D. 1 m tall. E. depends on how far the mirror is from the boy

B

What do electrons have that protons always have in equal magnitude? A. mass B. charge C. energy D. all of these E. none of these

B

When a 60-watt light bulb is connected to a 120-volt source the current in the light bulb is A. 0.25 A. B. 0.5 A. C. 2 A. D. 4 A. E. more than 4 A.

B

When a beta particle is ejected from a nucleus, the nucleus then has a greater A. mass. B. charge. C. both of these D. neither of these

B

Which astronomer spent 25 years making measurements of the stars' and planets' positions, only to die before the data was analyzed? A. Copernicus B. Brahe C. Kepler D. Galileo

B

Which has greater kinetic energy, a car traveling at 30 km/hr or a car of half the mass traveling at 60 km/hr? A. The 30 km/hr car. B. The 60 km/hr car. C. Both have the same kinetic energy. D. More information is needed about the distance traveled.

B

Which of the following is Kepler's first law? A. A line from the sun to the earth sweeps out equal areas in equal times. B. Planets move in elliptical orbits with the sun at one focus. C. The square of the period of the orbit is proportional to the cube of the orbital radius. D. For every action there is an equal and opposite reaction.

B

Which of the following statements is Newton's 1st law? A. Force equals mass times acceleration. B. Objects in motion will stay in motion and objects at rest will stay at rest unless acted upon by an outside force. C. For every action there is an equal and opposite reaction. D. There is an attractive force between any 2 objects in the universe.

B

Which part of the sun is considered the apparent surface of the sun? A. core B. photosphere C. chromosphere D. corona

B

Which part of the sun is the source of light that reaches the earth? A. core B. photosphere C. chromosphere D. corona

B

Why can't you or I travel at the speed of light? A. We are bigger than a photon. B. It would require an infinite amount of energy. C. We don't have enough fuel on Earth. D. It would require time travel. E. We can, we just haven't done it yet.

B

Your feet feel warmer on a rug than on a tile floor because a rug A. is usually warmer than tile. B. is a better insulator than tile. C. for the same mass has more internal energy than tile. D. all of these E. none of these

B

Two charges separated by one meter exert 1-N forces on each other. If the charges are pulled to 3-m separation distance, the force on each charge will be A 0.33 N B 0.11 C 0 D 3 E 9

B 0.11

It takes 1.8J to push a heavy chair 10m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box in newtons? a 18 b .18 c. 176.4 d 5.6 e 98

B 0.18 w=fd 1.8j - f(10)

An object is dropped and freely falls to the ground with an acceleration of 1g downward. If it is thrown upward at an instead, its acceleration will be A. 0g B 1g downward C. 1g upward D. Larger than 1g E. None of these

B 1g downward

Entropy is closely related to the A 1st law of thermodynamics B 2nd law of themodynamics C 0th law of thermodynamics D both of these E neither of these

B 2nd law of themodynamics

Convert 81 mph into m/s (1000m = 0.62mi) A 361 B 36.1 C 3.6 D 2161

B 36.1 81mi/1000m/1hr/1min ----------------------- 1hr/0.62mi/60min/60sec = 36.1m/s

a 4kg mass at the earths surface weighs ____ N A 4 B 39.2 C 0.4 D 384.2 E 9.8

B 39.2 weight = mg (4)(9.8)

It takes 23J to push a large box 4m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box in Newtons? A 4 B 5.8 C 23 D 92 E none of these

B 5.8 W = fd 23= f(4)

Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 sec. The power needed to do this job was A 20 B 50 C 100 D 1000 E 20000

B 50

A positive charge of 0.00098 C is 7 m from a negative charge of 0.003 C. What is the magnitude of the force of one of the charges due to the other charge in units of newtons? A 54 B 540 C 3780 D 180000 E 5400

B 540 F = KeQ1Q2 ---------- r^2 Test 3 # 30

Convert 15 mph into m/s (1000m = 0.62) A 67 B 6.7 C 0.7 D 402

B 6.7

The slope of a position vs. time graph tells you the A. Position B. Velocity C. acceleration D. Maximum position E. Time

B Velocity

Electric Charges of the opposite sign A Also have the same magnitude B attract each other C exert no forces on each other D repel each other

B attract each other

A main difference between gravitational and electric forces is that electrical forces A only attract B can repel or attract C obey the inverse Square law D only act over short distances E are weaker

B can repel or attract

The size of a white dwarf star is approximately the same as A jupiter B earth C a comet D the sun

B earth

In the SI unit system, mass is measured in units of A grams B kilograms C pounds D Newtons

B kilograms

Systems that are left alone, tend to move toward a state of A less entropy B more entropy C no entopy D peace E internal energy

B more entropy

Why are sunspots darker than the surrounding parts of the sun? A they are in a different layer B they are cooler than the surrounding material C they are warmer than the surrounding material D they contain different atoms than the surrounding material

B they are cooler than the surrounding material

It takes 6.7 J to push a heavy chair 10m , across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box in newtons? A. 67 B. 0.67 C. 656.6 D. 1.5 E. 98

B. 0.67

The specific heat capacity is the heat required to raise ___ of a substance by ____ A. 1 gram, 1 degree F B. 1 gram, 1 degree C C. 1 kilogram, 1 degree F D. 1 kilogram, 1 degree c E. 1 kilogram, 1000K

B. 1 gram, 1 degree C

If a freely falling object Were Somehow equipped with a speedometer its speed reading would increase each second by about A. 5 m/s B. 10 m/s C 15 m/s D. A variable amount E. depends on its initial speed

B. 10 m/s

A 6kg mass at the earths surface weighs ___N A. 6 B. 58.8 C. 0.6 D. 576.2 E. 9.8

B. 58.8 WEIGHT = mg = (6kg)(9.8m/s^2)

A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is A. zero B. Doubled C. quadrupled D. Unchanged E. halved

B. Doubled

An astronaut, floating alone in outer space, throws a baseball. If the ball floats away at speed of 20 meters per second, the astronaut will A. move in the opposite direction at a speed of 20 m/s B. Move in the opposite direction, but at a lower speed C. move in the opposite direction but at a higher speed D. Stay still E. move in the same direction as the baseball

B. Move in the oppostie direction, but at a lower speed

If an object moves with constant acceleration, its velocity must A. be constant B. change by the same amount each second C. Change by varying amounts D. always decrease

B. change by the same amount each second

A projectile is fired horizontally in a region of no air resistance. The projectile maintains its horizontal component of velocity because A. it is not acted on by any forces B. it is not acted on by any horizontal forces C. it has no vertical component of velocity to begin with D. the net force acting on it is zero E. None of these

B. it is not acted on by any horizontal forces

The SI units of velocity are A. m B. m/s C. m/s/s D. s E. s/m

B. m/s

Which of the following statements is Newtons 1st law? A. Force equals mass times acceleration B. objects in motion will stay in motion and objects at rest will stay at rest unless acted upon by an outside force C. For every action there is an equal and opposite reaction D. There is an attractice force between any 2 objects in the universe

B. objects in motion will stay in motion and objects at rest will stay at rest unless acted upon by an outside force

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its horizontal component of velocity a. increases b. remains unchanged c. decreases d. depends on the mass of the ball

B. remains unchanged

A Thermos bottle has double glass walls with silver coating on the glass surfaces that face one another. The silver coating reduces the energy that is transferred by A. conduction. B. convection. C. radiation. D. friction. E. none of these

C

A ball is moving at 3 m/s and has a momentum of 48 kg m/s. What is the ball's mass? A. 4 kg B. 12 kg C. 16 kg D. 144 kg E. none of these

C

A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed in the same direction, it would have hit the ground in A. less than 0.5 s. B. more than 0.5 s. C. 0.5 s. D. not enough information.

C

A force accelerates an object of mass M. The same force applied to a second object produces 4 times the acceleration. What is the mass of the second object? A. M B. 4M C. M/4 D. 16M E. M/16

C

A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later? A. 50 m B. 98 m C. 100 m D. 490 m E. 49 m

C

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its vertical component of velocity A. increases. B. remains unchanged. C. decreases. D. depends on the mass of the ball.

C

A spaceship in deep outer space is moving with a constant speed in a straight line. Which of the following is true? A. A single force is acting on the spaceship in the direction of motion. B. A single force is acting on the spaceship opposite the direction of motion. C. A net force of zero is acting on the spaceship. D. A constant net force is acting on the spaceship.

C

All of the following can induce a current in a coil of wire EXCEPT A. moving a magnet through the coil. B. placing a stationary coil of wire in an increasing magnetic field. C. placing a stationary coil of wire in a stationary magnetic field. D. placing a stationary coil of wire in an decreasing magnetic field. E. moving both the coil of wire and a magnet away from each other at the same speed.

C

An excited hydrogen atom is capable of emitting radiation of A. a single frequency. B. 3 frequencies. C. many more than 3 frequencies.

C

An object lifted 10 meters gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain is A. half as much. B. the same. C. twice as much. D. four times as much. E. more than four times as much.

C

An object that completes 20 vibrations in 10 seconds has a frequency of A. 0.5 hertz. B. 1 hertz. C. 2 hertz. D. 200 hertz.

C

At night an underwater scuba diver aims his flashlight beam toward the surface at an angle of 15 degrees with the normal. Upon emerging, the beam angle with respect to the normal will be A. less than 15 degrees. B. 15 degrees. C. more than 15 degrees. D. impossible to predict.

C

Electromagnetic induction was discovered by A. Hans Christian Oersted B. Isaac Newton C. Michael Faraday D. Benjamin Franklin E. Albert Einstein

C

Graph in hw 5 If a ball is released from rest at x = 0 m, what is its kinetic energy at x = 10 m? A. 0 J B. 3 J C. 6 J D. 10 J E. It is necessary to know the ball's mass.

C

How many electrons are in a neutral oxygen atom? A. 2 B. 4 C. 8 D. 16 E. 32

C

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be A. constant. B. less and less each second. C. greater than the second before. D. doubled. E. halved.

C

Light bends when it A. passes a massive star. B. passes through a gravitational field. C. both of these D. neither of these

C

Most alpha particles fired at a gold foil pass through undeflected because the A. electric field is zero inside the gold. B. gold atoms, unlike most other metal atoms, are relatively far apart. C. atoms of gold, like any others, are mostly empty space. D. net charge of the gold atoms is zero. E. none of these

C

On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in A. parallel. B. perpendicular. C. series. D. haste.

C

Running typically burns _____ Calories per mile. A. 30 B. 50 C. 100 D. 200 E. 500

C

Susan ascends a mountain via a short, steep trail. Sean ascends the same mountain via a long, gentle trail. Which of the following statements is true? A. Susan gains more gravitational potential energy than Sean. B. Susan gains less gravitational potential energy that Sean. C. Susan gains the same gravitational potential energy as Sean. D. To compare gravitational potential energies, we must know the height of the mountain. E. To compare gravitational potential energies, we must know the length of the two trails.

C

The SI units of acceleration are A. m B. m/s C. m/s/s D. s E. s/m

C

The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is A. 0.5 m. B. 1 m. C. 2 m. D. 4 m. E. 0.25 m.

C

The atomic mass number of an element is approximately the same as the number of its A. protons. B. neutrons. C. protons and neutrons. D. electrons. E. protons and electrons.

C

The current through a 10-ohm resistor connected to a 120-V power supply is A. 1 A. B. 10 A. C. 12 A. D. 120 A. E. none of these

C

The earth receives about 1.7 x 10^17 J of energy from the sun each second through a process called A. conduction. B. convection. C. radiation. D. sublimation. E. evaporation.

C

The freezing point of water in the Fahrenheit scale is A. - 273 degrees F. B. 0 degrees F. C. 32 degrees F. D. 100 degrees F. E. 212 degrees F.

C

The half-life of an isotope is one day. At the end of two days the amount that remains is A. none. B. one-half. C. one-quarter. D. one-eighth. E. none of these

C

The half-life of carbon-14 is 5730 years. If a 1-gram sample of old carbon is 1/8 as radioactive as 1-gram of a current sample, then the age of the old sample is about A. 716 years. B. 11,500 years. C. 17,200 years. D. 22,900 years. E. 46,000 years.

C

The input current of a transformer is 4 A. The primary coil has 50 loops and the secondary has 25 loops. The current that the transformer puts out is A. 2 A. B. 4 A. C. 8 A. D. 16 A. E. 32 A.

C

The power dissipated in a 4-ohm resistor carrying 3 A is A. 7 W. B. 18 W. C. 36 W. D. 48 W. E. not enough information to say

C

The same voltage is measured across two wires. Wire A carries twice the current of wire B. If the resistance of wire B is R, what is the resistance of wire A? A. R B. 2R C. R/2 D. 4R E. R/4

C

To catch a ball, a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball's motion. Doing this reduces the force of impact on the player's hand principally because the A. force of impact is reduced. B. relative velocity is less. C. time of impact is increased. D. time of impact is decreased. E. none of these

C

Two objects have the same size and shape, but one is much heavier than the other. When they are dropped simultaneously from a tower, they reach the ground at the same time, but the heavier one has a greater A. speed. B. acceleration. C. momentum. D. all of these E. none of these

C

What nationality was Nicholas Copernicus? A. Greek B. German C. Polish D. Italian

C

What type of radiation is most dangerous to humans? A. alpha B. beta C. gamma D. neutron

C

Which radiation has no electric charge associated with it? A. alpha rays B. beta rays C. gamma rays D. all of these E. none of these

C

You are riding on a train that is traveling at 90 mph. You throw a pen at your sister in the opposite direction that the train is moving at a speed of 7 mph. How fast does an observer standing on the ground outside the train see the ball travel? A. 90 mph B. 97 mph C. 83 mph D. 7 mph E. 630 mph

C

You started to run at 10 km/h when you left your house and you arrived at school 30 minutes later. Assuming that your average acceleration was 30 km/h/h, how fast were you running when you arrived? A. 15 km/h B. 20 km/h C. 25 km/h D. 30 km/h

C

_______ is heat transferred through the mass motion of a substance.

C

he Keck telescope in Hawaii is ___ stories tall. A. 2 B. 4 C. 8 D. 15

C

A Bullet fired horizontally over level ground hits the ground in 0.5 seconds if it had been fired with twice the speed in the same direction it would have hit the ground in A less than 0.5s B more than 0.5s C 0.5s D not enough information

C 0.5s

#32 in test 2 version A GRAPH In the graph, the acceleration of the object between 0 and 5 seconds is ___m/s/s A 4 B 5 C 0.8 D 1.25 E 0

C 0.8 Slope = 4m/s ---- 5s Acceleration = slope

A friend from Europe is visiting you and sees the weather forecast on TV. the forecast is for high temperature of 61 degrees Fahrenheit and your friend ask you what the temperature is in Celsius what do you tell her? A 141.8 B 43.2 C 16.1 D 334 E -212

C 16.1 C= 5/9 (F-32) C = 5 (61 - 32) ---------- 9

A 720 kg car moving at 1.2 m/s brakes to a stop in 5s. The magnitude of the braking force in N is A. 864 B. 600 C. 172.8 D. 4320

C 172.8 F= ^p OR p=mv ----- t F= Pf - Pi ------- t F= 0-(720kg)(1.2m/s) -------------------- 5s

A 230 kg car moving 4 m/c brakes to stop in 5 s. the magnitude of the braking force in N is A 920 B 57.5 C 184 D 4600

C 184 Pf - Pi ------- t 0-(230)(4) ----------- 5

The gravitational acceleration on the moon is 1/6 of that on earth. If an object weighs 15 N on earth, what is it's weight in Newtons on the moon? a 90 b 15 c 2.5 d 0.4

C 2.5 Weight =mg if g is 1/6, then weight is 1/6 = 15N ----- 6

The gravitational acceleration on the moon is1/6 of the that on Earth. If an object weighs 22 N on earth, what is its weight in newtons on the moon A 132 B 22 C 3.7 D 0.6

C 3.7 Weight = mg if g is 1/6 on moon , weight is 1/6 22N ----- 6

A 6.6 Ohm resistor has a 5-A current in it. What is the voltage across the resistor in Volts? A 5 V B 6.6 C 33 D 1.3 E 0.8

C 33

Two charges seperated by one meter exert 1-N forces on each other. If the magnitude of each charge is doubled, the force on each charge is A 1 B 2 C 4 N D 8 E 16

C 4 N

A 94 kg car is moving at 20km/h. If a 50 kg truck has 3 times the kinetic energy of the car, how fast is the truck moving in km/h? A 6.1 B 752 C 47.5 D 60 E 180

C 47.5 Ke= 1/2mv^2 Ke= 1/2 (94)(20)^2 = 18800 Ke = 3 x 18800 = 56400

A current of 6.6A passes through a lamp with a resistance of 2.2 ohms. What is the power supplied to the lamp in watts? A 14.52 B 3 C 95.8 D 31.9 E 0.3

C 95.8 see test #3 version A # 35

Which astronomer is credited with being the first to explain the complex motion of the stars and planets? A. Copernicus B. Brahe C. Ptolemy D. Galileo

C PTOLEMY

Disregarding air resistance, objects fall with constant A velocity B speed C acceleration D distances each successive second E position

C acceleration

The purpose of basic research is to A solve a specific problem B develop a new technology C acquire fundamental knowledge D make money

C acquire fundamental knowledge

The strength ( or magnitude ) of the electrical force between charges depends on the charges A magnitude B separation distance C magnitude and separation distance D sign E none of the above choices are correct

C magnitude and separation distance

Which astronomer chose to put the earth at the center of the universe? A copernicus B brahe C ptolemy D galileo E Kepler

C ptolemy

Particle A has twice the charge of nearby particle B. Compared to the force on Particle A, the force on particle B is A 4 times as much twice B twice as much C the same D half as much E none of the above choices are correct

C the same

A 1000 kg car and a 2000 kg car are hoisted the same distance. Raising more massive car requires A less work B as much work C twice as much work D four times as much work E more than four times as much work

C twice as much work

A spaceship in deep outer space is moving with a constant speed in a straight line which of the following is true? A. A single force is acting on the spaceship in the direction of motion B. A single force is acting on the spaceship opposite the direction of motion C. A net force of zero is acting on the spaceship D. A constant net force is acting on the spaceship

C. A net force of zero is acting on the spaceship

A force accelerates an object of mass M. The same force applied to a second object produces 4 times the acceleration. What is the mass of the second object? A. M B. 4M C. M/4 D. 16M E. M/16

C. M/4

The SI units of acceleration are A. m B. m/s C. m/s/s D. s E. s/m

C. m/s/s

To catch a ball, a baseball player extends the hand forward before impact with the ball and then let it ride backward in the direction of the balls motion doing this reduces the force of impact on the player's hand principally because the A. relative velocity is increased B. Relative velocity is less C. time of impact is increased D. Time of impact is decreased E. None of these

C. time of impact is increased

A 2-kg mass is held 4 m above the ground. What is the approximate potential energy of the mass with respect to the ground? A. 6 J B. 8 J C. 32 J D. 80 J E. none of these

D

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in meters per second per second? A. 1 B. 2 C. 3 D. 4 E. 5

D

A car initially travels west with a kinetic energy of 10 J. Then it travels east at three times its original speed. What is its kinetic energy when it is traveling east? A. 10 J B. 30 J C. -30 J D. 90 J E. -90 J

D

A light bulb carries a current I. The power dissipated in the light bulb is P. What is the power dissipated if the same light bulb carries a current of 3I? A. P B. 3P C. P/3 D. 9P E. P/9

D

A power line with a resistance of 2 ohms has a current of 80 A in it. The power dissipated in the line is A. 40 W. B. 160 W. C. 320 W. D. 12,800 W. E. none of these

D

Approximately how many years remain in the life of the sun? A. 1 million B. 5 million C. 1 billion D. 5 billion

D

Compared to special relativity, general relativity is more concerned with A. acceleration. B. gravitation. C. space-time geometry. D. all of these E. none of these

D

GRAPH HW 1 What is the slope of the graph? A. 10 m/s B. -10 m/s C. 3 m/s D. -3 m/s

D

In each second of a fall, the distance a freely falling object will fall is A. about 5 m. B. about 10 m. C. the same, but not 5 m or 10 m. D. increasing. E. none of these

D

Rutherford performed an experiment in which alpha particles were shot at a thin gold foil. About how many of the alpha particles bounced backward from the gold foil? A. 1/10 B. 1/100 C. 1/500 D. 1/1000 E. 1/10,000

D

The atomic number is the number of ______ in an atom. A. protons B. electrons C. neutrons D. protons or electrons E. protons or neutrons

D

The energy stored in one pound of fat is A. 35 Cal B. 350 Cal C. 1000 Cal D. 3500 Cal E. 5000 Cal

D

The first law of thermodynamics is a restatement of the A. principle of entropy. B. law of heat addition. C. Carnot cycle. D. conservation of energy. E. none of these

D

The net force on a moving object suddenly becomes zero. The object then A. stops abruptly. B. stops during a short time interval. C. changes direction. D. continues at a constant velocity. E. slows down gradually.

D

The power dissipated in each of two light bulbs is the same. The voltage across light bulb A is twice that of light bulb B. If the resistance of light bulb B is R, what is the resistance of light bulb A? A. R B. 2R C. R/2 D. 4R E. R/4

D

The rate of radioactive decay is proportional to the A. atomic number. B. atomic mass. C. number of neutrons. D. number of nuclei. E. number of electrons.

D

The slope of a velocity vs time graph tells you the A. position B. maximum velocity C. average velocity D. acceleration E. maximum position

D

Twelve seconds after starting from rest, an object falling freely will have a speed of A. 10 m/s. B. 50 m/s. C. 100 m/s. D. more than 100 m/s. E. 0 m/s

D

What nationality was Galileo Galilei? A. Greek B. German C. Polish D. Italian

D

What nationality was Tycho Brahe? A. Greek B. German C. Polish D. Danish

D

Which astronomer was imprisoned because of his support of the sun-centered universe model? A. Copernicus B. Brahe C. Kepler D. Galileo

D

Which of the following can only be seen during a solar eclipse? A. core B. photosphere C. radiation zone D. corona

D

Which of the following does not use a generator to produce electricity? A. coal power plant B. hydroelectric dam C. wind turbine D. solar panel E. nuclear power plant

D

Which part of the sun is the source of solar wind particles? A. core B. photosphere C. convection zone D. corona

D

Approximately how old is the universe? A 1.5 million years B 15 million years C 1.5 billion years D 15 billion years

D 15 billion years

A power line with a resistance of 2.2 ohms has a current of 46A in it. The power dissipated in the line in watts is A 101.2 B 222.6 C 20.9 D 4655.2 E 48.2

D 4655.2 P=IV V = IR V= (46) (2.2) = 101,2 P = (46A)(101.2)

What is the power in Watts required to exert a 60N force over 10 m in 7 s? A 600 B 420 C 6 D 85.7 E 5880

D 85.7 W = (60)(10) = 600j P= 600J ----- 7s

The language of physics is A latin B chinese C english D mathematics

D Mathematics

Which of the following is not part of the scientific method? A identifying patterns B Prediction C Observations D belief

D belief

Which of the following can only be seen during a solar eclipse? A core B photosphere C radiation zone D corona

D corona

Which part of the sun is the outermost layer? A core B photosphere C chromoshphere D corona E radiation zone

D corona

A figure skater is moving to the right at a constant speed which one of the following must be true neglect air resistance and friction A. no forces are acting on the figure skater B. A larger number of forces are acting on the figure skater to the rights than to the left C. The net force acting on the figure skater is to the right D no net force is acting on the figure skater E the net force acting on the figure skater is to the left

D no net force is acting on the figure skater

The net force on a moving object suddenly becomes zero. the object then A. stops abruptly B. Stops during a short time interval C. Changes direction D. continues at a constant velocity E. Slows down gradually

D. continues at a constant velocity

If an object's speed is doubled, its kinetic energy is a. the same b. doubled c. tripled d. quadrupled e. halved

D. quadrupled

A ball is thrown straight upward into the air. Neglect air resistance. While the ball is in the air, its acceleration A. increases. B. decreases C. is zero D. remains constant E. Changes direction

D. remains constant

A 10-ohm resistor has a 5-A current in it. What is the voltage across the resistor? A. 5 V B. 10 V C. 15 V D. 20 V E. more than 20 V

E

A 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters from the ground in the same amount of time. The power expended in raising the 50-kg sack is A. twice as much. B. half as much. C. four times as much D. one fourth as much E. the same.

E

A light aluminum ball and a heavy lead ball of the same size are allowed to roll down an incline. When they are halfway down the incline, they will have identical A. kinetic energies. B. potential energies. C. momentum. D. inertias. E. none of the above choices

E

A net force of 64 N acts on a mass of 16 kg. What is the acceleration of the object? A. 16 m/s/s B. 0.51 m/s/s C. 64 m/s/s D. 9 m/s/s E. 4 m/s/s

E

The mass of a nucleus is exactly equal to the sum of the masses of its individual A. separated protons. B. separated neutrons. C. separated electrons. D. all of these E. none of these

E

When an electron transitions from the 2nd excited state to the first excited state, it gives off A. an atom. B. a neutron. C. a proton. D. an electron. E. a photon.

E

Which of the following is not a property of a wave? A. wavelength B. frequency C. period D. amplitude E. time

E

The electric power of a lamp that carries 2 A at 120 V is A 1/6 watts B 2 watts C 60 D 20 E 240 Watts

E 240 Watts P=IV p= (2)(12)

An object moves with decreasing speed. Which of the following is true? A The work done on the body is positive, and the kinetic energy is increasing. B The work done on the body is positive, and the kinetic energy is decreasing C The work done on the body is zero, and the kinetic energy is increasing D The work done on the body is negative, and the kinetic energy is increasing E The work done on the body is negative, and the kinetic energy is decreasing

E The work done on the body is negative, and the kinetic energy is decreasing

Entropy Measures A Temperature at constant pressure B temperature at constant volume C temperature as pressure increases D temperature as volume increases E disorder

E disorder

True or False: In the Bohr model of the atom, electrons can orbit the nucleus with any radius. A. True B. False

FALSE

True or False: Speed has a direction.

FALSE

True or False: The first step in the hydrogen burning process is a helium atom fusing with a hydrogen atom. A. True B. False

FALSE

True or False: The spectrum of a hydrogen atom is the same as the spectrum of a helium atom. A. True B. False

FALSE

True or False: A leaf floating up and down in a pond is an example of a longitudinal wave. A. True

False

True or False: A pulsar is a rotating red giant

False

True or False: A reflecting telescope uses a lens to reflect the light

False

True or False: A tennis ball following a parabolic trajectory without air resistance has two forces acting on it; gravity downward and a force keeping it moving forward.

False

True or False: As a box slides along a rough horizontal surface and comes to rest, it's kinetic energy is transformed into potential energy

False

True or False: Hubble's law states that the further away a galaxy is from Earth, the faster it is moving towards us

False

True or False: If you cut a bar magnet in half, you will get a magnet that is only a north pole and a magnet that is only a south pole.

False

True or False: In an induction stove, the surface of the stove heats up.

False

True or False: The image formed on the detector in a camera is virtual.

False

True or False: We can determine if a star is moving toward or away from earth by measuring its brightness

False

True or False: When insulating your house, you want to look for insulation with a lower R-value.

False

True or False: temperature is a form of energy

False

True or false: A tennis ball following a parabolic trajectory without air resistance has two forces acting on it; gravity downward and a force keeping it moving foward

False

True or false: Speed has a direction

False

The two poles of a magnet are ____ and _____ .

North and south

True or False: In each step of the hydrogen burning process, energy is released. A. True B. False

TRUE

True or False: Kinetic energy is proportional to the square of an object's velocity.

TRUE

True or False: Telescopes are often placed on mountains because there is less atmosphere at high elevations. A. True B. False

TRUE

True or False: The Earth gives off radio waves. A. True B. False

TRUE

True or False: The sun gives off radio waves

TRUE

True or False: The sun is just an ordinary star. A. True B. False

TRUE

True or False: Velocity has a direction.

TRUE

True or False: When an electron transitions from the first excited state to the ground state it gives off energy. A. True B. False

TRUE

True or False: Gravitational potential energy depends on the object's mass.

True

True or False: Heat is a form of energy.

True

True or False: If you simultaneously send pulses of high frequency X-rays and low frequency radio waves from the earth to the moon, both waves will arrive at exactly the same time (assuming a vacuum between earth and moon).

True

True or False: Lenses have two focal points.

True

True or False: Scientific results must be reproducible

True

True or False: Stars that are moving away from us are called " red- shifted"

True

True or False: The Universe is expanding

True

True or False: The earth has a magnetic field

True

True or False: The sun gives off radio waves A. True B. False

True

True or False: The sun is just an ordinary star

True

True or False: Thermometers are usually based on the idea of thermal expansion.

True

True or false: Two identical projectiles are launched with equal speeds from the top of a building and feel no air resistance. projectile a is launched about the horizontal while projectile B is launched below the horizontal. Both projectiles have exactly the same as acceleration while they're in the air

True

True or false: Velocity has a direction

True

It takes 51 J to push a large box 4 m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the bow in newtons? a. 4 b. 12.8 c. 51 d. 204 e. none of these

W=Fd 51J = F(4m) b. 12.8

The SI units of power are

Watts

What was the main problem with J. J. Thomson's plum pudding model of the atom? A. The atom's size was too big. B. It didn't have the correct number of electrons. C. It couldn't reproduce experimental data. D. The electrons were too small. E. The atom's size was too small.

c

Two charged particles repel each other with a force F. The charge of one of the particles is doubled and the distance between them is also doubled, in the force will be a F b 2F c F/2 d F/4 e none of these

c F/2

Which scientist discovered that the universe is made up of galaxies? a einstein b galileo c hubble d copernicus

c hubble

Stars that have ____ mass than the sun will end their lives as white dwarfs. A more B less C the same

c the same

Near-sightedness is also called

myopic, myopia

The north end of one magnet will be attracted to the ____ end of another magnet.

south

True or False: The wavelength of a radio wave can be as long as 10ft

true

True or false: One of the keck telescopes is a reflecting telesope

true