phy2414 final review

Vector a has magnitude 8.0 m at an angle of 30 degrees below the +x axis. The y component of a is -6.9 m. 6.9 m. 4.0 m. -4.0 m.

-4.0 m.

A driver, traveling at 22 m/s, slows down her 2000 kg car to stop for a red light. What work is done by the friction force against the wheels? -2.2 x 104 J -9.68 x 105 J -4.84 x 105 J -4.4 x 104 J

-4.84 x 105 J

what is the conversion factor between cm2 and m2? 0.01 m2/cm2 100 m2/cm2 10000 m2/cm2 0.0001 m2/cm2

0.0001 m2/cm2

What is the gravitational force on a 70-kg person standing on the Earth, due to the Moon? The mass of the Moon is 7.36 x 1022 kg and the distance to the Moon is 3.82 x 108 m. 0.24 N 0.00024 N 0.024 N 0.0024 N

0.0024 N

How many grams is forty milligrams? 0.000040 g 0.00040 g 0.040 g 40000 g

0.040 g

A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 s. What is the linear speed of a point 0.10 m from the center of the wheel? 0.16 rad/s 0.31 rad/s 0.079 rad/s 0.63 rad/s

0.31 rad/s

A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 s. What is the frequency of the wheel's rotation? 0.50 Hz 1.0 Hz 2.0 Hz 4.0 Hz

0.50 Hz

What is the cosine of 55? 0.57 0.574 0.5736 0.6

0.57

The wavelength in air of a sound wave of frequency 500 Hz is 1.8 m. 0.69 m. 0.75 m. 1.5 m.

0.69 m.

What is the ratio of the speed of sound in air at 0C to the speed at 100C? 1.1 0.85 0.75 0.95

0.85

1 angstrom = 10-10 m and 1 fermi = 10-15 m, what is the relationship between these units? 1 angstrom = 10^-25 fermi 1 angstrom = 10^-5 fermi 1 angstrom = 10^+25 fermi 1 angstrom = 10^5 fermi

1 angstrom = 10^5 fermi

The mass of an electron is 9.1 x 10^-31 kg. How many electrons will make a mass of 1.0 kg? 9.1 x 10^30 9.1 x 10^31 1.1 x 10^31 1.1 x 10^30

1.1 x 10^30

A plastic block of dimensions 2.00 cm x 3.00 cm x 4.00 cm has a mass of 30.0 g. What is its density? 1.25 g/cm3 0.80 g/cm3 1.60 g/cm3 1.20 g/cm3

1.25 g/cm3

What is the difference between 103.5 and 102.24? 1.3 1.260 1.26 1.2600

1.3

A motorcycle has a mass of 250 kg. It goes around a 13.7 m radius turn at 96.5 km/h. What is the centripetal force on the motorcycle? 719 N 2.95 x 103 N 1.31 x 104 N 4.31 x 104 N

1.31 x 104 N

The coefficients of static and kinetic frictions for plastic on wood are 0.50 and 0.40, respectively. How much horizontal force would you need to apply to a 3.0 N plastic calculator to start it moving from rest? 0.15 N 1.2 N 1.5 N 2.7 N

1.5 N

What is the gauge pressure at a location 15.0 m below the surface of sea? (The density of seawater is 1.03x 103 kg/m3.) 1.47 x 105 N/m2 1.51 x 105 N/m2 1.01 x 105 N/m2 2.52 x 105 N/m2

1.51 x 105 N/m2

The mass of the Moon is 7.4 x 1022 kg and its mean radius is 1.75 x 103 km. What is the acceleration due to gravity at the surface of the Moon? 9.80 m/s2 2.8 x 106 m/s2 0.80 m/s2 1.6 m/s2

1.6 m/s2

When the length of a simple pendulum is tripled, the time for one complete vibration increases by a factor of 3. 1.4. 2. 1.7.

1.7.

A 0.060-kg tennis ball, initially moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s. What is the change in momentum of the ball? 0.72 kgm/s 1.8 kgm/s 1.1 kgm/s 0.36 kgm/s

1.8 kgm/s

If you are 5'10'' tall, what is your height in meters? (1 in = 2.54 cm.) 1.5 m 1.6 m 1.8 m 1.7 m

1.8 m

What is the intensity of a 70-dB sound? 10-5 W/m2 10-6 W/m2 10-7 W/m2 10-4 W/m2

10-5 W/m2

A 3.00-kg pendulum is 28.84 m long. What is its period on Earth? 0.09278 s 7.891 s 10.78 s 4.897 s

10.78 s

A 500-N weight sits on the small piston of a hydraulic machine. The small piston has area 2.0 cm2. If the large piston has area 40 cm2, how much weight can the large piston support? 10000 N 40000 N 500 N 25 N

10000 N

A wheel accelerates with a constant angular acceleration of 4.5 rad/s2. If the initial angular velocity is 1.0 rad/s, what is the angle the wheel rotates through in 2.0 s? 4.5 rad 7.0 rad 9.0 rad 11 rad

11 rad

A cart starts from rest and accelerates at 4.0 m/s2 for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of 2.0 m/s2 for 4.0 s. What is the final speed of the car? 12 m/s 20 m/s 10 m/s 16 m/s

12 m/s

A car goes from 40 m/s to 80 m/s in a distance of 200 m. What is its average acceleration? 12 m/s2 9.6 m/s2 24 m/s2 8.0 m/s2

12 m/s2

An object is thrown upward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravity is 2.5 m/s2. How long does it take for the object to return to where it is thrown? 8.0 s 6.0 s 12 s 10 s

12 s

A brick weighs 50.0 N, and measures 30.0 cm x 10.0 cm x 4.00 cm. What is the maximum pressure it can exert on a horizontal surface? 12.5 kPa 1.25 Pa 1.25 kPa 12.5 Pa

12.5 kPa

A rifle bullet is fired at an angle of 30 below the horizontal with an initial velocity of 800 m/s from the top of a cliff 80 m high. How far from the base of the cliff does it strike the level ground below? 140 m 160 m 150 m 130 m

140 m

A car is negotiating a flat curve of radius 50 m with a speed of 20 m/s. The centripetal force provided by friction is 1.2 x 104 N. What is the mass of the car? 500 kg 1000 kg 2000 kg 1500 kg

1500 kg

What is the frequency of a wave which has a period of 6.00 ms? 16.7 kHz 16.7 Hz 167 Hz 1.67 kHz

167 Hz

If you hear thunder 5.0 s after seeing a flash of lightning, the distance to the lightning strike is about 600 m. 2200 m. 1700 m. 1200 m.

1700 m.

If you walk 6.0 km in a straight line in a direction north of east and you end up 2.0 km north and several kilometers east. How many degrees north of east have you walked? 60 71 19 45

19

A point on a wheel rotating at 5.00 rev/s is located 0.200 m from the axis. What is the centripetal acceleration? 0.050 m/s2 1.35 m/s2 48.0 m/s2 198 m/s2

198 m/s2

A wheel of radius 1.0 m is rotating with a constant angular speed of 2.0 rad/s. What is the linear speed of a point on the wheel's rim? 4.0 m/s 1.0 m/s 2.0 m/s 0.50 m/s

2.0 m/s

In the Atwood machine shown in Fig. 4-1, if M = 0.60 kg and m = 0.40 kg, what is the magnitude of the acceleration of the system? (Ignore friction and the mass of the pulley.) 5.3 m/s2 3.9 m/s2 2.0 m/s2 0.98 m/s2

2.0 m/s2

How many rad/s is 25 revolutions per minute equivalent to? 0.42 rad/s 160 rad/s 240 rad/s 2.6 rad/s

2.6 rad/s

How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W) 3.6 x 103 J 2.7 x 106 J 4.5 x 104 J 4.8 J

2.7 x 106 J

A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water below. How far does the rock travel horizontally before striking the water? 14 m 20 m 16 m 24 m

20 m

If it takes 50 m to stop a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same condition? 200 m 100 m 400 m 50 m

200 m

How many m/s is 50 mi/h equivalent to? (1 mi = 1609 m.) 45 m/s 2.2 m/s 49 m/s 22 m/s

22 m/s

A bulldozer drags a log weighing 500 N along a rough surface. The cable attached to the log makes an angle of 30.0 with the ground. The coefficient of static friction between the log and the ground is 0.500. What minimum tension is required in the cable in order for the log to begin to move? 224 N 289 N 500 N 268 N

224 N

55 mi/h is how many m/s? (1 mi = 1609 m.) 90 m/s 25 m/s 120 m/s 49 m/s

25 m/s

What is the product of 12.56 and 2.12? 26.627 26.23 27 26.6

26.6

An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip? 270 mi/h 275 mi/h 280 mi/h 260 mi/h

270 mi/h

A car travels 20 km West, then 20 km South. What is the magnitude of its displacement? 0 km 28 km 20 km 40 km

28 km

A person of weight 480 N stands on a scale in an elevator. What will the scale be reading when the elevator is accelerating downward at 4.00 m/s2? 284 N 676 N 480 N 196 N

284 N

The hydrogen atom consists of a proton of mass 1.67 x 10-27 kg and an orbiting electron of mass 9.11 x 10-31 kg. In one of its orbits, the electron is 5.3 x 10-11 m from the proton. What is the mutual attractive force between the electron and proton? 3.6 x 10-47 N 5.4 x 10-47 N 1.8 x 10-47 N 7.0 x 10-47 N

3.6 x 10-47 N

A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the car? 3.9 x 10^3 N 1.9 x 10^5 N 2.7 x 10^4 N 2.6 x 10^2 N

3.9 x 10^3 N

A projectile is launched with an initial velocity of 60.0 m/s at an angle of 30.0 above the horizontal. How far does it travel? 184 m 318 m 160 m 152 m

318 m

A 400-m tall tower casts a 600-m long shadow over a level ground. At what angle is the Sun elevated above the horizon? 48 can't be found; not enough information 34 42

34

A liquid has a specific gravity of 0.357. What is its density? 3570 kg/m3 357 kg/m3 643 kg/m3 1000 kg/m3

357 kg/m3

A hot air balloon rises to an altitude of 600 fathoms. What is this height, in feet? (1 fathom = 6ft) 600 ft 1200 ft 3600 ft 100 ft

3600 ft

A wheel of radius 1.0 m is rotating with a constant angular speed of 2.0 rad/s. What is the centripetal acceleration of a point on the wheel's rim? 4.0 m/s2 1.0 m/s2 2.0 m/s2 0.50 m/s2

4.0 m/s2

Which one of the following is not equivalent to 2.50 miles? (1 mi = 1.609 km = 5280 ft, 1 ft = 12 in.) 4.40 x 10^3 yd 1.58 x 10^5 in. 4.02 x 10^3 km 1.32 x 10^4 ft

4.02 x 10^3 km

Two vectors a and b have components (0, 1) and (-1, 3), respectively. What is magnitude of the sum of these two vectors? 4.1 3.2 2.8 3.9

4.1

An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s after traveling 90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it? 2.00 x 10^3 N 2.82 x 10^3 N 4.17 x 10^3 N 3.62 x 10^3 N

4.17 x 10^3 N

On a day when the speed of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back the sound? 0.425 m 8.50 m 4.25 m 0.850 m

4.25 m

A rectangle is 3.25 m long and 1.5 m wide. What is its area? 4.875 m2 4.87 m2 4.9 m2 4.80 m2

4.9 m2

Two vectors, of magnitudes 20 and 50, are added. Which one of the following is a possible answer for the magnitude of the resultant? 10 20 40 80

40

A car traveling 20 m/s rounds an 80-m radius horizontal curve with the tires on the verge of slipping. How fast can this car round a second curve of radius 320 m? (Assume the same coefficient of friction between the car's tires and each road surface.) 20 m/s 160 m/s 80 m/s 40 m/s

40 m/s

A car starting from rest moves with constant acceleration of 2.0 m/s2 for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of -2.0 m/s2. How far does it travel? 400 m 200 m 500 m 300 m

400 m

A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s2 for 15 s. At the end of this time, what is its velocity? 375 m/s 45 m/s 30 m/s 15 m/s

45 m/s

A projectile is launched with an initial velocity of 60.0 m/s at an angle of 30.0 above the horizontal. What is the maximum height reached by the projectile? 69 m 46 m 23 m 92 m

46 m

A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet? 25 m/s 49 m/s 98 m/s 9.8 m/s

49 m/s

Substance A has a density of 3.0 g/cm3 and substance B has a density of 4.0 g/cm3. In order to obtain equal masses of these two substances, the ratio of the volume of A to the volume of B will be equal to 1:4. 4:3. 3:4. 1:3.

4:3.

Vector a = (1, 3). Vector b = (3, 0). Vector c = a + b . What is the magnitude of ? 4 7 3 5

5

A football field is 120 yd long and 50 yd wide. What is the area of the football field, in m2, if 1 yd = 91.44 cm? 5.0 x 10^3 m2 4.2 x 10^3 m2 3.7 x 10^3 m2 2.4 x 10^3 m2

5.0 x 10^3 m2

The radius of the Earth is 3963 mi. What is the surface area of the Earth in square meters? ( 1 mi = 1609 m.) 2.6 x 10^14 m2 4.9 x 10^7 m2 5.1 x 10^14 m2 1.3 x 10^14 m2

5.1 x 10^14 m2

A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed? 5.3 km/h 4.5 km/h 0.09 km/h 0 km/h

5.3 km/h

Starting from city A, a car drives 250 miles east to city B, then 300 miles north to city C, and finally 700 miles west to city D. What is the distance between city A and city D? 300 mi 500 mi 600 mi 400 mi

500 mi

What is the frequency of a 2.5 m wave traveling at 1400 m/s? 178 Hz 5.6 kHz 560 Hz 1.78 kHz

560 Hz

An object moves with a constant speed of 30 m/s on a circular track of radius 150 m. What is the acceleration of the object? 0.17 m/s2 zero 5.0 m/s2 6.0 m/s2

6.0 m/s2

what is the sum of 2.67 + 1.967 + 2.1? 6.476 6.7460 6.7 6.75

6.7

You shout at a cliff, and hear the echo in 4.00 s. The temperature is 0C. How far away is the cliff? 1760 m 1320 m 662 m 680 m

662 m

What must be your average speed in order to travel 350 km in 5.15 h? 67.0 km/h 68.0 km/h 69.0 km/h 66.0 km/h

68.0 km/h

What is the momentum of a 2000-kg truck traveling at 35 m/s? 7.0 x 104 kgm/s 3.5 x 104 kgm/s 57 kgm/s 7.0 x 105 kgm/s

7.0 x 104 kgm/s

A ball is thrown straight up with a speed of 36.0 m/s. How long does it take to return to its starting point? 11.0 s 14.7 s 7.35 s 3.67 s

7.35 s

what is the conversion factor between km/h2 and m/s2? 2.78x10^-1 m/s2 7.72x10^-6 m/s2 1.30x10^4 m/s2 3.60 m/s2

7.72x10^6 m/s2

The acceleration of gravity on the Moon is one-sixth what it is on Earth. An object of mass 72 kg is taken to the Moon. What is its mass there? 72 N 12 kg 72 kg 12 N

72 kg

An object of mass 6000 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping distance if the load is not to slide forward into the cab? 30 m 15 m 150 m 75 m

75 m

An object is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravity is 1.5 m/s2. How long does it take for the object to reach the maximum height? 8.0 s 11 s 14 s 16 s

8.0 s

A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown? 8.9 m/s 8.1 m/s 6.1 m/s 7.4 m/s

8.1 m/s

A horizontal force of 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the cart? 6.0 m/s 73 m/s 36 m/s 8.5 m/s

8.5 m/s

A traffic light of weight 100 N is supported by two ropes as shown in Fig. 4-2. What are the tensions in the ropes? 50 N 63 N 66 N 83 N

83 N

The intensity level by 15 engines in a garage is 100 dB. What is the intensity level generated by one engine? 88 dB 67 dB 13 dB 44 dB

88 dB

A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip? 89 km/h 84 km/h 90 km/h 91 km/h

89 km/h

A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746 W) 80 hp 70 hp 90 hp 60 hp

90 hp

A 500-kg elevator is pulled upward with a constant force of 5500 N for a distance of 50.0 m. What is the work done by the 5500 N force? -5.20 x 105 J 3.00 x 104 J 2.75 x 105 J -2.45 x 105 J

??

The kinetic friction force between a 60.0-kg object and a horizontal surface is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop? 30.0 m 375 m 750 m 15.0 m

??

The speed of an ultrasonic sound of frequency 45 kHz in air is 352 m/s. What is the air temperature? 36C 35C 33C 34C

??

Which of the following is not a unit of pressure? mm of mercury Pascal atmosphere N/m

??

You lift a 10-N physics book up in the air a distance of 1.0 m, at a constant velocity of 0.50 m/s. What is the work done by the weight of the book? -10 J +5.0 J +10 J -5.0 J

??

Which of the following is an accurate statement? If the magnitude of vector A is less than the magnitude of vector B, then the x-component of A is less than the x-component of B. The magnitude of a vector can be less than the magnitude of one of its components. The magnitude of a vector can be positive or negative. A vector cannot have zero magnitude if one of its components is not zero.

A vector cannot have zero magnitude if one of its components is not zero.

Suppose that an object is moving with constant acceleration. Make a statement concerning its motion with respect to time. In equal times its speed increases by equal amounts. A statement cannot be made using the information given. In equal times its velocity changes by equal amounts. In equal times it moves equal distances.

In equal times its velocity changes by equal amounts.

Suppose a skydiver jumps from a high-flying plane. What is her acceleration when she she reaches terminal velocity? It is approximately 9.8 m/s2 downward. It is a constant pointing upward. It is in the upward direction. It is essentially zero.

It is essentially zero.

Consider a particle moving with constant speed such that its acceleration of constant magnitude is always perpendicular to its velocity. It is moving in a circle. It is moving in a parabola. None of these is definitely true all of the time. It is moving in a straight line.

It is moving in a circle.

When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion? Both its acceleration and its velocity are constant. Its velocity is constant. Neither its acceleration nor its velocity is constant. Its acceleration is constant.

Its acceleration is constant.

The acceleration due to gravity is lower on the Moon than on Earth. Which of the following is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth? Mass is less, weight is same. Both mass and weight are the same. Mass is same, weight is less. Both mass and weight are less.

Mass is same, weight is less.

What is the SI unit of momentum? N/s Ns N/m Nm

Ns

Which of the following is a false statement? "Pitch" (in music) and frequency have approximately the same meaning. Sound waves are longitudinal pressure waves. Light travels very much faster than sound. Sound can travel through a vacuum. The transverse waves on a vibrating string are different from sound waves.

Sound can travel through a vacuum.

Under what condition is average velocity equal to the average of the object's initial and final velocity? The acceleration must be constant. The acceleration must be constantly changing. This can only occur if there is no acceleration. This is impossible.

The acceleration must be constant.

Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration. The acceleration must be constantly decreasing. The acceleration must be a constant non-zero value. The acceleration must be equal to zero. The acceleration must be constantly increasing.

The acceleration must be equal to zero.

Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. The acceleration is zero. The car is decelerating, and its acceleration is positive. The car is decelerating, and its acceleration is negative. A statement cannot be made using the information given.

The car is decelerating, and its acceleration is negative.

Suppose that an object travels from one point in space to another. Make a comparison between the displacement and the distance traveled. The displacement is either less than or equal to the distance traveled. The displacement is always equal to the distance traveled. The displacement can be either greater than, smaller than, or equal to the distance traveled. The displacement is either greater than or equal to the distance traveled.

The displacement is either less than or equal to the distance traveled.

Three forces, each having a magnitude of 30 N, pull on an object in directions that are 120 apart from each other. Make a statement concerning the resultant force. The resultant force is less than 30 N. The resultant force is zero. The resultant force is greater than 30 N. The resultant force is equal to 30 N.

The resultant force is zero.

A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average collision force is correct? It is impossible to tell since the masses and velocities are not given. The small car and the truck experience the same average force. The truck experiences the greater average force. The small car experiences the greater average force.

The small car and the truck experience the same average force.

A 3.0-kg object moves to the right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is correct? The total momentum both before and after the collision is 24 kgm/s. The total momentum both before and after the collision is zero. None of these is true. The total momentum before the collision is 24 kgm/s, and after the collision is 0 kgm/s.

The total momentum both before and after the collision is zero.

Which of the following operations will not change a vector? Rotate it. Multiply it by a constant factor. Translate it parallel to itself. Add a constant vector to it.

Translate it parallel to itself.

A net force F accelerates a mass m with an acceleration a. If the same net force is applied to mass 2m, then the acceleration will be 4a. a/2. a/4. 2a.

a/2.

Action-reaction forces sometimes act on the same object. always act on different objects. always act on the same object. may be at right angles.

always act on different objects.

What determines "loudness" of a musical note? phase velocity frequency amplitude

amplitude

Mass and weight are both measured in kilograms. both measure the same thing. are exactly equal. are two different quantities.

are two different quantities.

A new car manufacturer advertises that their car can go "from zero to sixty in 8 s". This is a description of average speed. instantaneous acceleration. instantaneous speed. average acceleration.

average acceleration.

select the list which contains only SI basic units. liter, meter, second, watt joule, newton, second, watt joule, kelvin, kilogram, watt candela, kelvin, meter, second

candela, kelvin, meter, second

the metric prefix for one-hundredth is kilo centi mega milli

centi

Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. When these two vectors are added, the magnitude of the sum could be as small as 2.0 m, or as large as 12 m. is larger than 12 m. is 12 m. is 2.0 m.

could be as small as 2.0 m, or as large as 12 m.

A golf club hits a golf ball with a force of 2400 N. The golf ball hits the club with a force exactly 2400 N. close to 0 N. slightly more than 2400 N. slightly less than 2400 N.

exactly 2400 N.

the number of significant figures in 10001 is two five three six

five

the number of significant figures in 0.01500 is five three two four

four

What determines the "pitch" of a musical note? frequency amplitude wavelength phase

frequency

in the CGS system, what are the fundamental units? gram, centimeter, minute gram, centimeter, second newton, centimeter, second kilogram, meter, second

gram, centimeter, second

List the four fundamental forces in nature. gravitational, normal, tension, friction gravitational, electromagnetic, strong nuclear, weak nuclear gravitational, electromagnetic, contact, nuclear gravitational, normal, kinetic friction, static friction

gravitational, electromagnetic, strong nuclear, weak nuclear

When is kinetic energy conserved? in any collision in which the objects do not stick together in elastic collisions in all collisions in inelastic collisions

in elastic collisions

Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. As time progresses, the distance between them decreases. remains constant. increases. cannot be determined from the information given.

increases.

An object moving in the +x axis experiences an acceleration of 2.0 m/s2. This means the object is increasing its velocity by 2.0 m/s in every second. traveling at 2.0 m in every second. traveling at 2.0 m/s in every second. changing its velocity by 2.0 m/s.

increasing its velocity by 2.0 m/s in every second.

Sound vibrations with frequency less than 20 Hz are called supersonics. ultrasonics. none of these infrasonics.

infrasonics.

Two objects collide and stick together. Kinetic energy is conserved only if the collision is elastic. is conserved only if the environment is frictionless. is definitely conserved. is definitely not conserved.

is definitely not conserved.

The acceleration of an object is inversely proportional to its position. its mass. the net force acting on it. its velocity.

its mass.

the metric prefix for one thousand is centi kilo mega milli

kilo

the metric prefix for one-thousandth is milli kilo centi mega

milli

When a cannon fires a cannonball, the cannon will recoil backward because the momentum of the cannon is greater than the energy of the cannonball. energy of the cannon is greater than the energy of the cannonball. momentum of the cannonball and cannon is conserved. energy of the cannonball and cannon is conserved.

momentum of the cannonball and cannon is conserved.

A ball drops some distance and gains 30 J of kinetic energy. Do not ignore air resistance. How much gravitational potential energy did the ball lose? cannot be determined from the information given less than 30 J more than 30 J exactly 30 J

more than 30 J

If the velocity of an object is zero, does it mean that the acceleration is zero? Support your answer with an example. yes, because of the way in which velocity is defined no, and an example would be an object starting from rest no, and an example would be an object coming to a stop yes, because of the way in which acceleration is defined

no, and an example would be an object starting from rest

The time for one cycle of a periodic process is called the amplitude. period. frequency. wavelength.

period.

Pressure is inversely proportional to force and proportional to area. proportional to both force and area. proportional to force and inversely proportional to area. inversely proportional to both force and area.

proportional to force and inversely proportional to area.

Density is proportional to both mass and volume. inversely proportional to both mass and volume. inversely proportional to mass and proportional to volume. proportional to mass and inversely proportional to volume.

proportional to mass and inversely proportional to volume.

Angular acceleration is expressed in units of alphas per second squared. radians per second squared. arcs per second squared. meters per second squared.

radians per second squared.

Angular velocity is expressed in units of omegas per second. arcs per second. meters per second. radians per second.

radians per second.

Angular displacement is usually express in units of meters. revolutions. radians. arcs.

radians.

Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. As time progresses, the difference in their speeds increases. remains constant. decreases. cannot be determined from the information given.

remains constant.

the base SI unit of time is minute hour millisecond second

second

how many basic units does the SI system have? ten seven four five

seven

A golf ball traveling 3.0 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is equal to 3.0 m/s. slightly greater than 3.0 m/s. much less than 3.0 m/s. slightly less than 3.0 m/s.

slightly less than 3.0 m/s.

The three common phases of matter are solid, liquid, and gas. solid, plasma, and gas. solid, liquid, and vapor. condensate, plasma, and gas.

solid, liquid, and gas.

For a wave, the frequency times the wavelength is the wave's intensity. speed. power. amplitude.

speed.

The force that keeps you from sliding on an icy sidewalk is kinetic friction. weight. static friction. normal force.

static friction.

A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. Since a lot of damage is done on the car the force on the truck is greater then the force on the car. the truck did not slow down during the collision. the force on the truck is smaller than the force on the car. the force on the truck is equal to the force on the car.

the force on the truck is equal to the force on the car.

The quantity mgy is the kinetic energy of the object. the work done on the object by the force. the gravitational potential energy of the object. the power supplied to the object by the force.

the gravitational potential energy of the object.

A 100-kg football linebacker moving at 2.0 m/s tackles head-on an 80-kg halfback running 3 m/s. Neglecting the effects due to digging in of cleats, the linebacker will drive the halfback backward. this is a simple example of an elastic collision. the halfback will drive the linebacker backward. neither player will drive the other backward.

the halfback will drive the linebacker backward.

The quantity 1/2 mv2 is the kinetic energy of the object. the potential energy of the object. the power supplied to the object by the force. the work done on the object by the force.

the kinetic energy of the object.

Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hz sound through air is the same. none of these one-half as great. twice as great.

the same.

Compared to the wavelength of a 400 Hz sound, the wavelength of a 200 Hz sound in air is none of these twice as long. the same. one-half as long.

twice as long.

the number of significant figures in 0.040 is one four two three

two

Which one of the following is an example of a vector quantity? area velocity distance mass

velocity

all of the following are base units of the SI system except: kilogram meter volt kelvin

volt

If you run a complete loop around an outdoor track (400 m), in 100 s, your average velocity is 0.25 m/s. 40,000 m/s. zero. 4.0 m/s.

zero.