WMU Physics
The pressure at the bottom of aquarium A is greater than that at the bottom of aquarium B. Why might this be?
A is filled to a greater depth than B
What is the cost of operating a 3.00-W electric lamp for 2 years if the cost of electricity is $0.0800 per KW.h?
$4,2048
Albert Einstein lowers a book of mass m downward a distance h at constant speed v. The work done by the force of gravity is...
+
Some telephoto cameras use a mirror rather than a lens. What radius of curvature mirror is needed to replace a 800 mm focal length telephoto lens?
+1.6m
A system has 30 J of heat added to it and in doing so, it does 25 J of work. (work is done by the system) The change in internal energy will be
+5J
Kinetic Energy
Energy associated with an objects motion -KE
Internal Energy
Energy associated with the internal structure of the object. -a hot rock has more internal energy than a cold rock -lifting either increases the external PE but not the internal energy
Potential Energy
Energy associated with the systems position or orientation -PE
Gravitational Potential Energy
Equals the work done by gravity. -if you life an object, you must apply a force at least equal to the objects weight
What method is involved when charges in an uncharged metal object are rearranged without direct contact with the charged object?
Induction
The tendency of matter to remain in constant motion unless acted on by an outside, unbalanced force is called
Inertia
Which of the following is Archimedes' principle?
The buoyant force of an object is equal to the weight of the fluid displaced by an object.
What is the name of the following statement: "When two systems are in thermal equilibrium with a third system, then they are in thermal equilibrium with each other"?
Zeroth Law of Thermodynamics
The electric field shown in the diagram is produced by a single point charge at the center of the picture. What force will a negative charge placed at location C feel?
a force down and to the right
Renatta Oyle is again found driving her '86 Yugo down Lake Avenue, leaving the following trail of oil drops on the pavement. If her car is moving from right to left, then ...
her velocity has a leftward direction and her acceleration has a leftward direction.
Which requires more work: lifting a 50.0 kg crate a vertical distance of 2.0 meters or lifting a 25.0 kg crate a vertical distance of 4.0 meters?
both require the same amount of work
How come birds can land on overhead power lines without getting electrocuted?
both their feet are on the same wire, so they don't complete a circuit
An ice skater is in a fast spin with her arms held tightly to her body. When she extends her arms, which of the following is true
her total angular momentum remains constant
An increase in the depth of water creates what kind of change in water pressure?
increase
Electric Charge
is an inherent physical property of a certain subatomic particles that is responsible for electrical and magnetic phenomena.
Elastic Collisions
is one in which the total kinetic energy remains constant
At what point in its path is the horizontal component of the velocity (V x ) of a projectile the smallest?
it is the same throughout the path
lf an object has a density of 14g/cm^3 and it is put in a container of water, what would happen to it?
it would sink
If the particles of the medium are vibrating to and from in the same direction of energy transport, then the wave is a ____wave.
longitudinal
Gauge Pressure
the pressure relative to the current atmospheric pressure
The perpendicular distance from the center of curvature to a spherical mirror is called
the radius of curvature
After an elastic collision of two balls, the kinetic energies of the two balls are measured to be 12J and 24J. What can be said about the kinetic energy of the two balls before the collision?
the total kinetic energy of the two balls was 36J
If an object has an acceleration of 0 m/s^2 , then one can be sure that the object is not ______________.
changing velocity
A pendulum makes exactly 40 vibrations in 20.0 s. Its period is ____. (Be cautious of the units.)
0.500s
If an object has a mass of 4 grams and a volume of 8 cubic centimeters, what would be its density?
0.5g/cm^3
If it takes one minute for an airplane to reach speed 100 m/s from start to take -off . How long is the take- off path ( airplane displacement in that time) .
3km
A 100-g toy car is propelled by a compressed spring that starts it moving. The car follows the curved track . Show that the final speed of the toy car is___ m/s, if its initial speed is 2.00 m/s and it coasts up the frictionless slope, gaining 0.180 m in altitude.
0.687 m/s
A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is
8V
9 m North plus 9 m South
0m
A ball is thrown 5m straight up . It takes 0.2 s to return back to the start position. What is the ball displacement after that time ?
0m
An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal. What is the total flight time (between launch and touching the ground) of the object?
1.72s
An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal. b) What is the total flight time (between launch and touching the ground) of the object?
1.72s
Problem 1: An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal. a) What is the maximum height reached by the object?
3.64m
A particle of charge +q is a distance r away from a charged flat surface and experiences a force of magnitude F pulling it toward the surface. What is the magnitude of the force exerted on a particle of charge +q when the distance is 2r from each others?
1/4∗F
A 50-kg platform diver hits the water below with a kinetic energy of 5000 Joules. The height (relative to the water) from which the diver dove was approximately ______________ meters.
10
A heater is rated at 1200 watts for a 120 volt source. The current in amperes drawn by the heater is
10
When a teacher stands at the front of the class, the force of gravity pulls her toward the ground. The ground pushes back with an equal and opposite force. This is an example of which of Newton's Laws of Motion?
3rd
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s^2. The distance traveled by ball is
20m
A ball is kicked with an initial velocity of 16 m/s in the horizontal direction and 12 m/s in the vertical direction. At what speed does the ball hit the ground?
20m/s
A monkey throws a banana horizontally from the top of a tree. The banana hits the ground 4 seconds later and lands 80 meters from the base of the tree. How fast did the monkey throw the banana?
20m/s
An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal. d) What is the magnitude of the velocity of the object just before it hits the ground?
20m/s
Which one of the following quantities is NOT a vector?
20m/s
An electric toaster operating on 120 volts draws a current of 6 amperes. The resistance of the toaster is
20ohms
What is the repulsive force between two pith balls that are 8.00 cm apart and have equal charges of -30.0 nC? (k -electrostatic constant)
.27∗10 ^−3N
A ray of light strikes a plane mirror perpendicular to the mirror. What is the angle of reflection
0
What is the acceleration of a car that maintains a constant velocity of 55 mi/hr for 10.0 seconds?
0
When a ball rises vertically to a height h and returns to its original point of projection, the work done by the gravitational force is
0
You carry a 20 N box 5 m horizontally across a room. The work you do is
0
The amount of net force required to keep a 5-kg object moving rightward with a constant velocity of 2 m/s is ______________.
0 N
A swimmer swims 20 laps in a north--south facing pool in 7mins. Her first lap is toward the north. Her displacement and average velocity at the end of the 20laps are
0,0
How much taller does the Eiffel Tower become at the end of a day when the temperature has increased by 15°C? Its original height is 321 m and you can assume it is made of steel. (coefficient of extension for steel= 1.2 10^−5 / C)
0.058m
A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stop watch measures the ball's trajectory time from table to the floor to be 0.30 s. How far away from the table does the ball land? (g = 9.8 m/s^2) and air resistance is negligible
0.072m
Calculate the value of capacitance needed to store 1 µC of charge at 10V ( 1 µC =0.000001 C )
0.10 ùF
When a 12 volt car battery is short circuited with a wire, the current drawn from the battery is 100 amperes. The resistance of the wire is
0.12ohms
Suppose two children push horizontally, but in exactly opposite directions, on a third child in a wagon. The first child exerts a force of 75.0 N, the second a force of 90.0 N, friction is 12.0 N, and the mass of the third child plus wagon is 23.0 kg. What would be the acceleration ?
0.13m/s^2 in the direction of the 2nd child push
Blood is pumped from the heart at a rate of 5.0 L/min into the aorta (of radius 1.0 cm). Determine the speed of blood through the aorta
0.27m/s
1km/h= m/s
0.28
A ball is rolled horizontally off a table with an initial speed of 0.24 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.30 s. What is the height of the table? (g = 9.8 m/s^2) and air resistance is negligible
0.44m
A 10-Newton object moves to the left at 1 m/s. Its kinetic energy is approximately ______________ Joules.
0.5
What is the specific heat capacity of a substance if 2.41x104 J are needed to change the temperature of 105.0 g of it from 25.0ºC to 250.0ºC? Give the answer in J/gºC
1.02 J/g C
How much work is done by the boy pulling his sister 30.0 m in a wagon with angle 48 degrees to the horizontal using force 60.0 N? Assume no friction acts on the wagon.
1.2 kJ
The speed of light in a certain medium is 2.2 × 10 (8) m/s. What is the index of refraction of this medium?
1.4
What isWhat is the approximate total capacitance of the parallel circuit of two capacitors 470 pF and 1 nF ? (1pF= 0.001nF)
1.47nF
Calculate the voltage applied to a 2.00 μF capacitor when it holds 3.10 μC of charge
1.55 V
If you push on a wall with a force of -10 Newtons, the force acting on you is
10 Newtons
On the Celsius scale, water boils at ? degrees.
100
An airplane moves at 141 km/h toward the northeast (45 degrees). What is its component velocity in the northward direction?
100 km/h
One kiloPascal is equal to:
1000 Newton of force per square meter
Some species of whales can dive to depths of 1 kilometer. What is the total pressure they experience at this depth? (Density = 1020 kg/m^3 and 100 000 N/m^2 = 1 ATM.)
100ATM
Some species of whales can dive to the depth of 1 kilometer. What is the total pressure they experience at this depth? (Density = 1020 kg/ m^3 and 100 000 N/m^2= 1 ATM.
100ATM
A ball is projected into the air with 100 J of kinetic energy which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is ______________.
100J
A certain man has a mass of 80 kg and a density of 955 kg/m^3 (excluding the air in his lungs). Find the buoyant force air exerts on him. ( air density 129 kg/m^3
102 N
A heater is rated at 1200 watts for a 120 volt source. The resistance in ohms of the heater is
12
If three identical bulbs are connected in parallel across a 12V battery, the voltage across each bulb will be
12V
During takeoff a jet aircraft goes from 0m/s to 60m/sec in 5 seconds. What is the jets acceleration?
12m/s^2
A cube-shaped block of pinewood has a surface area of 9 m² and a density of 0.5 g /cm ^3 Its mass equals
13500 kg
A cube-shaped block of pinewood has a surface area of 9 m² and a density of 0.5 g cm-3. Its mass equals
13500kg
What force must be exerted on the master cylinder of a hydraulic lift to support the weight of a 2000-kg car (a large car) resting on the slave cylinder? The master cylinder has a 2.00-cm diameter and the slave has a 24.0-cm diameter.
136 N
An airplane that flies at 100 km/h in a 100 km/h hurricane crosswind has a speed (relative to the ground) of?
141 km/h
If a 10 kilogram object accelerates suddenly at 15 m/s2, how much force was applied to the object?
150 N
A marble rolls down a frictionless track, and reaches speed v at the bottom. If you want it to reach a speed of 4v at the bottom, you need the start of the new track to be
16 times as high
How much force is needed to accelerate a 90 kg skier 2 m/s^2?
180 N
Verify the ranges for the projectiles motion for an initial velocity of 50 m/s at the given initial angles= 45 degree. ( g = 9.8 m/s^2 )
255m
A 250 cm³ flask of glass filled with seawater weighs 350 g. density of seawater if empty flask weighs 100 g would be
1g/cm^3
During takeoff a jet goes from 0m/s to 60m/s in 5 seconds. Whats the jets speed after 22 seconds?
260m/s
An electric motor on an airplane operates on 24 volts and draws a current of 15 amperes. How much energy does the motor use during a 2 hour flight?
2,592,000J
An object is placed 10 cm from a convex lens of focal length 20 cm. What is the magnification?
2.0
A type of cuckoo clock keeps time by having a mass bouncing on a spring, usually something cute like a cherub in a chair. What force constant (k ) is needed to produce a period of 0.500 s for a 0.0150-kg mass?
2.37 N/m
A searchlight installed on a truck requires 60 watts of power when connected to 12 volts. What is its resistance?
2.4ohms
Mercury (density = 13.6 g/cm^3 ) commonly supplied in flasks containing 34.5 kg . What is the volume in liters (L) of mercury?
2.54 L
An airplane flies horizontally with a speed of 300 m/s at an altitude of 400 m. Assume that the ground Is level. At what horizontal distance from a target must the pilot release a bomb so as to hit the target?
2.7km
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s ^2. The velocity the ball in m/s
20
A heater is rated at 1200 watts for a 120 volt source. If two heaters are connected in parallel across the 120 volt source, the current in amperes drawn from the source is
20
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts. The resistance of the light bulb in ohms is
20
Which of the following frequency ranges can most humans hear?
20 Hz-20,000 Hz
A person is pulling west with 35 N of force against a person pulling east with 15 N of force. What is the net force?
20 N West
What is the frequency of a wave that has a speed of 0.4 m/s and a wavelength of 0.020 meter?
20 hertz
A fireman, stays away from a burning building, directs a stream of water from a fire hose at an angle of 30.0° above the horizontal. If the initial speed of the stream is 40.0 m/s, what is maximum height of the water
20.4m
A period of 0.005 seconds would be equivalent to a frequency of ____ Hz
200
A student adds two vectors with magnitudes of 200 and 40. Which one of the following is the closest possible choice for the magnitude of the resultant?
200
The average speed of an object which moves 10 kilometers (km) in 30 minutes is ______________.
20km/hr
A 6.0 kg object moving 5.0 m/s collides with and sticks to a 2.0- kg object. After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of the 6.0 kg object. Determine the speed of the 2.0 kg object before the collision.Only magnitude of velocity of second object)
23m/s
If the frequency of a wave is 24 Hz and the wavelength is 10 m, the wave's speed is
240 m/s
A child on a merry-‐go-‐round is moving with speed 4 m/s in a circle with radius 2 m. If the child's mass is 30 kg, what is the centripetal force?
240N
When poked by a spear, an operatic soprano lets out a 1200-Hz shriek. What is its wavelength if the speed of sound is 345 m/s?
28.8cm
Arvin the Ant travels 30 cm eastward, then 25 cm northward, and finally 15 cm westward. What is Arvin's direction of displacement with respect to his original position?
29 N of E
Arvin the Ant is on a picnic table. He travels 30 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the magnitude of Arvin's net displacement?
29cm
A 4 000 g object has a momentum of 12 kg•m/s. The object's speed is ______________ m/s.
3
A capacitor connected to a 12 V battery holds 36 micro Coulomb of charge on each plate. What is the capacitance ?
3 micro Farads
On takeoff, a rocket accelerates from rest at a rate of 50.0 m/s^2 for exactly 1 minute. The rocket's speed after this minute of steady acceleration will be ______________ m/s.
3.00x10^3
A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally distant from the point of release. What is the speed of the ball just before it strikes the ground?
3.2 m/s B 14 m/s C 290 m/s D (correct answer) None of the above
How many Joules of energy are in one kilowatt-hour?
3.6 MJ
An electric motor on an airplane operates on 24 volts and draws a current of 15 amperes. What is the power consumption of the motor?
360 watts
The energy used by a 100 watt light bulb in 1 hour is
360,000J
Which two angles will produce the same range? (in degrees)
30 and 60
A baseball pitcher delivers a fast ball. During the throw, the speed of the ball increases from 0 to 30.0 m/s over a time of 0.100 seconds. The average acceleration of the baseball is ______________ m/s ^2 .
300
Plane A is flying at 400 mph in the northeast direction relative to the earth. Plane B is flying at 500 mph in the north direction relative to the earth. What is the direction of motion of Plane B as observed from Plane A?
37.50 N of W
A hydraulic lift raises a 2000-kg automobile when a 500-N force is applied to the smaller piston. If the smaller piston has an area of 10 cm^2 , what is the cross-sectional area of the larger piston?
392 cm^2
To sterilize a 50.0-g glass baby bottle, we must raise its temperature from 22.0°C to 95.0°C. How much heat transfer is required? Specific heat of glass = 840 J/kg C
3066 J
27 ft South plus 14 ft East
30ft
An object is launched at a velocity of 20 m/s in a direction making an angle of 25° upward with the horizontal c) What is the horizontal range (maximum x above ground) of the object?
31.26m
A rifle is aimed horizontally at the center of a large target 60 m away. The initial speed of the bullet is 240 m/s. What Is the distance from the center of the target to the point where the bullet strikes the target?
31cm
On the Fahrenheit scale, water freezes at ? degrees.
32
How much heat transfer (in kilocalories) is required to thaw a 0.450-kg package of frozen vegetables originally at 0°C if their heat of fusion is the same as that of water? Latent heat or Heat of Fusion for vegetables =78.9 kcal/kg
35.9 kcal
A 0.5-kg ball moving at 5 m/s strikes a wall and rebounds in the opposite direction with a speed of 2 m/s. If the impulse occurs for a time duration of 0.01 s, then the average force (magnitude only) acting upon the ball is ______________ Newtons.
350
Plane A is flying at 400 mph in the northeast direction relative to the earth. Plane B is flying at 500 mph in the north direction relative to the earth. What is the speed of Plane B as observed from Plane A?
357mph
If I short out a D cell and draw a current of 7 A for 5 s, how many coulombs of charge move through the circuit?
35C
During open hear surgery, a defibrillator can be used to bring a patient out of cardiac arrest. The resistance of the path is 500 Ω and a 10.0-mA current is needed. What voltage should be applied?
5V
Find the frequency of a tuning fork that takes to complete one oscillation.
400 Hz
If the current in a wire of a CD player is 5.00mA, how long would it take for 2.00C of charge to pass a point in this wire?
400s
How much work is done by the engines of a plane of mass 20,000 kg when ascending at a constant speed of 20.0 m/s for 10.0 s? (ignore drag)
40MJ
John's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and erect, what is the focal length of the mirror?
40cm
The 1 kg block of ice melts into water and then its temperature rises to 25degrees of Celcius The amount of heat absorbed by the ice as it melts and warms the water is (specific heat capacity of ice = 2,000 J/kg-°C, latent heat of fusion of water = 334,000 J/kg, specific heat capacity of water = 4,000 J/kg-°C)
434000 J
Mass of 4585 kg and its density is 917 kg m-3, its volume would be
5m^3
Which angle produces the greatest range?
45 degrees
The light bulb used in a slide projector draws a current of 4 amperes when operating on 120 volts. What is the bulb's power consumption?
480
If three identical bulbs are connected in series across a 12V battery, the voltage across each bulb will be
4V
You push on a block on frictionless ice with a force of 8 N, causing it to accelerate at 2 m/s ^2.The mass of the block is
4kg
The resistance (in ohms) of an electric bulb drawing 1.2 A current at 6.0 V is...
5
A car of mass 1000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kg⋅m 2 /s) relative to the center of the race track?
5,000,000
An arrow is drawn back so that 50 Joules of potential energy is stored in the stretched bow and string. When released, the arrow will have a kinetic energy of ______________ Joules.
50
Suppose a 60.0-kg gymnast climbs a rope. What is the tension in the rope if he climbs at a constant speed?
588 N
Using 1kJ of work, a small object is lifted from the ground floor to the third floor of a tall building in 20.0 seconds. What power was required in this task?
50 W
A platform diver weighs 500 N. She steps off a diving board that is elevated to a height of 10 meters above the water. The diver will possess ______________ Joules of kinetic energy when she hits the water.
5000
A bullet in a gun is accelerated from the firing chamber to the end of the barrel at an average rate of 6.20×10^5m/s ^2 for 8.10×10 ^−4 s. What is its muzzle velocity (that is, its final velocity)?
502m/s
A force of 200 N acts tangentially on the rim of a wheel 25 cm in radius. Find the torque
50Nm
A powerful motorcycle can accelerate from rest to 26.8 m/s (100 km/h) in only 3.90 s. How far does it travel in that time?
52.3m
What is the power of the eye when viewing an object 50.0 cm away? ( distance of an image from the eye lens is 2 cm)
52D
Two people are pulling a refrigerator into a garage. One person is pulling south with 30 N of force, while the other person is pulling south with 25 N of force. What is the net force?
55 N South
A light ray has an angle of incidence of 34º. The reflected ray will make what angle with the reflecting surface?
56
One of the hottest temperatures ever recorded on the surface of Earth was 134°F in Death Valley, CA. What is this temperature in Celsius degrees?
57
What power is supplied to the starter motor of a large truck that draws 250 A of current from a 24.0-V battery hookup?
6000 W
Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is
60km/h
A light inextensible rope is used to pull a particle of mass 2.5 kg along a rough horizontal plane. If the tension in the rope ( applaied force) is 25 N and acts at an angle of 25◦ above the horizontal and the coefficient of kinetic friction between the particle and the surface is 0.55, what is the acceleration of the particle?
6.0 m/s^2
What is the length of a pendulum that has a period of 0.500 s?
6.21cm
A stonecutter's chisel has an edge area of 0.7 cm^2 . If the chisel is struck with a force of 42 N, what is the pressure exerted on the stone?
600 000 N/m^2
A stonecutter's chisel has an edge area of 0.7 cm ^2 . If the chisel is struck with a force of 42 N, what is the pressure exerted on the stone?
600,000 N/m^2
What is the resistance (in ohms) of a 2.50 -kΩ and a 4.00-kΩ resistor connected in series?
6500
Calculate the effective resistance of a pocket calculator that has a 1.35-V battery and through which 0.200 mA flows.
6750 ohms
What fraction of an iceberg is submerged? (density (ice) = 917 kg/m^3 , density (sea) = 1030 kg/m^3.)
89%
How much work does a supermarket checkout attendant do on a can of soup he pushes 50 cm horizontally with a force of 15.00 N? Express your answer in joules .
7.5 J
How much energy in J there is in 20 kWh?
72,000,000J
A heater is rated at 1200 watts for a 120 volt source. If two heaters are connected in parallel across the 120 volt source, the total power in watts drawn from the source is
720
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts. The power consumed by the light bulb in watts is
720
King Kong carries Andrea up 321 m tall Empire State Building .At the top of the skyscraper Andrea's shoe falls from her foot . How fast will the shoe be moving when it hits Felix's car below ? g=9.8m/s/s
79m/s
A runner in a race takes 2.7 seconds to go from the 40 meter mark to the 70 meter mark. How far would the runner go in 8 seconds if this speed is maintained?
89m
What frequency is received by a person watching an oncoming ambulance moving at 110 km/h and emitting a steady 800-Hz sound from its siren? The speed of sound on this day is 345 m/s.
878 Hz
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s^2. The acceleration of the ball just before hitting the ground in m/s ^2 is meters is
9.8
Gravitational Acceleration "g" on the Earth has the magnitude of
9.8m/s^2
An automobile manufacturer claims that its product will, starting from rest, travel 0.40km in 9.0s. What is the magnitude of the constant acceleration required to do this?
9.9m/s^2
A car travels north at 30m/s for one half hour. It then travels south at 40m/s for 15mins. The total distance the car has traveled and its displacement are
90km, 18km N
Mass of oil is 11040 kg and volume is 12 m³, its density would be
920 kg m-3
What is the resistance (in ohms) of a 1.00 10 2 -Ω, a 2.50 -kΩ, and a 4.00-kΩ connected in parallel?
93.9
Voltage can be induced in a wire by
A moving the wire near a magnet B moving a magnet near the wire C changing the current in a nearby wire D (correct answer) all of these
Which one of the following is NOT consistent with a car which is accelerating?
A car is moving with a high speed in a straight line
Three resistors 2 ohm, 3 ohm, and 4 ohm are connected so that the equivalent resistance is 9 ohm. The resistors are connected _______
All in series
What force makes you feel lighter in the water?
Buoyant force
Device that is used to store charge is named as
Capacitor
Which of the following is not an example of a hydraulic system?
Computer
You hold one end of a solid metal rod in a fire, and the other end becomes hot. This is an example of
Conduction
Which mechanism of heat transfer is involved in heating water or air ?
Convention
Which of the following is NOT a unit of heat?
Fahrenheit
The proper name for farsightedness is
Hyperopia
When a current 'I' flows through a resistance 'R' for time 't' the electrical energy spent is given by ______
I^2 Rt
When a fuse is rated 3 A, it means ______
It will melt if current exceeds 3 A
Which of the following is not a unit for power?
Joule
Which of the following temperature scales doesn't have negative numbers?
Kelvin
Which of the following is a correct expression for magnification?
M = -di/do
An battery is used to ______
Maintain a potential difference
Energy
Measure of a systems ability to do work. - E (symbol for energy) -Energy has he same units as work
Which law states the need to wear seat belts?
Newton's First Law
Which of Newton's Three Laws does the following statement satisfy? An object at rest tends to stay at rest and an object in motion tends to stay in motion in a straight line at a steady speed until an unbalanced force acts upon it.
Newton's First Law
Which of Newton's Three Laws does the following statement satisfy? The relationship between an object's mass (m), its acceleration (a), and the applied force F is F=ma. Acceleration and force are vectors. This law requires that the direction of the acceleration vector is in the same direction as the net force vector.
Newton's Second Law
Which of Newton's three laws does the following example illustrate? If you have a hockey puck sliding along a table, it will eventually come to a stop.
Newton's Second Law
A hockey puck slides without friction along a frozen lake toward an ice ramp and plateau as shown. The speed of the puck is 4m/s and the height of the plateau is 1m. Will the puck make it all the way up the ramp? answerable question reference
No
When a crown of mass 14.7 kg is submerged in water, a scale reads only 13.4 kg. Is the crown made of gold? density of the water = 1000 kg/m^3 or 1g /cm^3
No, bc density of that crown is 11.3g/cm^3
Inelastic Collisions
One in which the total kinetic energy does not remain constant
A hydraulic press allow large masses to be lifted with small forces as a result of which principle?
Pascal's
What is it called when a sound wave makes an object vibrate at its natural frequency?
Resonance
Which mechanism of heat transfer is involved in heat flow from Sun to Earth?
Radiation
Which of the following is not a vector?
Speed
The second law of thermodynamics would back up this statement: Heat will never of itself flow from a cold object to a hot object
True
The second law of thermodynamics would tell you that you can't get more work out of a machine than the amount of energy that you put in.
True
The electric force between two particles is directly proportional to their charges and inversely proportional to the square of the distance between them.
What is Coulomb's Law?
The difference in electric potential between 2 points, or the work per unit charge (the work required to create the potential difference by separating charges)
What is voltage?
In the equation: change in U = Q - W , -W stands for ?
Work done by the system
Resistance
a measure of the opposite to current flow
What is the path of a projectile (in the absence of friction)?
a parabola
Ten seconds after being dropped from rest, a free-falling object will be moving with a speed of
about 100m/s
The acceleration of a body is
always in the same direction as the net force on the body.
Bronco is a skydiver. His mass is 100 kg. What is his weight in Newtons?
around 1000N
The image formed in a plane (flat) mirror is
at the same distance behind the mirror as the object is in front of the mirror
Which has more internal energy, a bathtub full of cool water or a cup of hot water?
bathtub full of cool water
An object is placed in front of a convex mirror at a distance closer than the focal length of the mirror. The image will appear
behind, right and left, and upright and reduced
If the current is switched on as shown in the diagram which way does the wire move?
downwards
According to Newton's Third Law, action and reaction are
equal and in opposite directions
Which of the following is not an example of a fluid?
clay
The law of ______________ of energy states that energy cannot be created or destroyed.
conservation
The mirror on the passenger side of most newer cars is a
convex mirror
The three secondary colors of light are ____
cyan, magenta, and yellow
Two charged bodies separated by a distance d exert an electrical force on each other. The charge on one of the bodies is doubled. The electrical forces on each body now
double
As you climb higher up a mountain, air pressure would:
decrease
f the diameter of a wire increases, its resistance
decreases
Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body now
decreases by 1/4
The splitting of white light into the different colored lights by a prism is called
dispersion
A truck driving along a highway road has a large quantity of momentum. If it moves at the same speed but has twice as much mass, its momentum is ______________.
double
If an object is moving eastward and slowing down, then the direction of its velocity vector is ______________.
eastward
When an object floats in a liquid, the buoyant force is __ the weight of the object.
equal to
In order for an object to float in a container of water its density must be
equal to 1 gram per cubic centimeter
A kWh is a unit of
energy
Waves transfer what from a source to a receiver?
energy
A football is kicked into the air at an angle of 45 degrees with the horizontal. At the very top of the ball's path, its velocity is?
entirely horizontal
A football is kicked into the air at an angle of 45 degrees with the horizontal. At the very top of the ball's path, its acceleration is? (ignore air resistance)
entirely vertical
Which of the following is defined as a push or a pull?
force
The number of cycles of a periodic wave occurring per unit time is defined as a wave's ____
frequency
A fullback is running down the football field in a straight line. He starts at the 0-yard line at 0 seconds. At 1 second, he is on the 10-yard line; at 2 seconds, he is on the 20-yard line; at 3 seconds, he is on the 30-yard line; and at 4 seconds, he is on the 40-yard line. This is evidence that
he is moving with a constant speed (on avg.)
Two forces of 4 N and 12 N act on a body simultaneously. The net force on the body is
impossible to tell from the given information
An aluminum plate has a circular hole. If the temperature of the plate increases, what happens to the size of the hole?
increases
If the temperature of a wire increases, its resistance
increases
A lens that is thicker at the center than the edges
is a converging lens
The resistance of a wire depends on _____
length, material and area of cross-section
Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the amount of water displaced in the salt water is _____________
less
ln order for an object to sink in a container of water, its density must be:
less than 1 gram per cubic meter
What is the SI unit of speed?
m/s
Which of the following is a correct equation for Snell's law?
n1/n2 = sinθ2/sinθ1
Mass Density
mass per unit vol. of a substance
A magnetic field exerts a force on an electric charge if the charge is
moving
If car A passes car B, then car A must be ______________.
moving faster than car B, but not necessarily accelerating
The speed-time graph for a particle moving at constant speed is a straight-line ______________ to the time axis.
parallel
Which one of the following CANNOT transmit sound?
perfect vacuum
The force on an electron moving in a magnetic field will be the largest when its direction is
perpendicular to the magnetic field direction
The electric field shown in the diagram is produced by a single point charge at the center of the picture. What type of charge produces the electric field shown?
positive
The main factor which effects the speed of a sound wave is the ____.
properties of the medium
The electric field shown in the diagram is produced by a single point charge at the center of the picture. If a new positive point charge is placed at location A directly to the right of the one pictured, the force on it will
push it to the right
The three primary colors of light are ____
red, blue, green
How would you increase the voltage output of a generator?
rotate the coil faster
As an object freely falls, its
speed increases
As an object speeds up uniformly , its ______________.
speed increases
A light ray in air enters and passes through a block of glass. What can be stated with regard to its speed after it emerges from the block?
speed is the same as that before it entered glass
Name the instrument used to measure instantaneous speed of a vehicle
speedometer
Ohm's Law
that the current in a conductor is equal to the voltage applied to it divided by the resistance
Bernoulli's Principle
states that for a fluid undergoing steady flow, the pressure is lower where the fluid is flowing faster.
Archimedes Principle
states that the buoyant force acting on an object in a fluid at rest is equal to the weight of the fluid displaced by an object
Pascal's Principle
states that the pressure applied to an enclosed fluid is transmitted undiminished to all parts of the fluid and to the walls of the container.
A ball is thrown straight upward. At the top of its trajectory, its acceleration is..
straight down
A ball free falls straight down off a table taking t 1 to reach the ground. Now you roll a second ball off of the table and it takes a time t2. How do the two times compare?
t1=t2
Weight is best described as
the downward force exerted on an object due to gravity
Pressure
the force per unit area for a force acting perpendicular to a surface
Absolute Pressure
the gauge pressure plus the atmospheric pressure
An iron nail is brought near a magnet. Which of these is not true?
the nail becomes a north pole or south pole
If the net force on an object is zero,
the objects acceleration must be zero
As in the video "A bullet shoot vs bullet drop", the measurable times were
the same
A boat moves through the water in a river at a speed of 8 m/s relative to the water. The boat makes a trip downstream and then makes a return trip upstream to the original starting place. Which trip takes longer?
the upstream tip
Voltage
the work that a charged particle can do divided by the size of the charge
When the particles of a medium are vibrating at right angles to the direction of energy transport, then the wave is a ____wave.
transverse
An object's inertia depends on its mass.
true
When a positively charged object is brought near an electroscope, what happens to its metal leaves: pulled closer together, pushed farther apart, or nothing? → Pushed farther apart. Because the electrons in the leaves are attracted towards the top. Then then both leaves take on a positive charge, and like charges repel.
true
A 1200 kg car and a 2400 kg car are lifted to the same height at a constant speed in a auto service station. Lifting the more massive car requires ______________ work.
twice as much
Two marbles, one twice as heavy as the other, are dropped to the ground from the roof of a building. (Assume no air resistance.) Just before hitting the ground, the heavier marble has..
twice as much kinetic energy as the lighter one
An object is raised above the ground gaining a certain amount of potential energy. If the same object is raised twice as high it gains ______________.
twice as much potential energy
If a magnet is pushed into a coil, voltage is induced across the coil. into a coil with twice the number of loops,
twice as much voltage is induced
Car A has a mass of 1000 kg and a speed of 60 km/h, and car B has a mass of 2000 kg and a speed of 30 km/h. The kinetic energy of car A is ______________.
twice that of B
Which type of quantity is characterized by both magnitude and direction?
vector
The image formed by a concave mirror when the object is placed between the mirror and the focal point has the following characteristics:
virtual, upright, enlarged,
Weight Density
weight per unit vol. of a substance
If an object is moving eastward and slowing down, then the direction of its acceleration vector is ______________.
westward
