PT 1:

5. If a truck has 1/5 times the acceleration of a SUV, and the two vehicles are pushed with an equal force, you would expect the mass of the truck to be

A. 1/50 times that of the SUV.
B. 1/5 times that of the SUV.
C. 50 times that of the SUV.
D. 5 times that of the SUV.

6. The hang time (time one’s feet are off the ground in a jump) for most athletes is

A. about 10 seconds.
B. considerably more than 1 second.
C. the sum of the rising and falling times.
D. slightly more than 1 second.

10. A tow truck accelerating it at 4 m/s/s, exerts how much force on a car when the mass of the car is 2000 kg?

A. 667 kg
B. 1000 N
C. 2000 N
D. 8000 N

16. A ball is dropped from an unknown height in meters and at an unknown time (t) in seconds. Its instantaneous speed in m/s is

A. 0 m/s2.
B. about 5 m/s.

C. 10t m/s.

D. 20t m/s.

49. A 3,000 kg car and a 6,000 kg truck are both originally at rest. The resulting acceleration of the car is 8m/s2 and of the truck is 4m/s2. What was the force exerted on the car and the truck?

A. 10,000 N
B. 12,000 N.
C. 18,000 N.
D. 24,000 N.

Eval 4:

17. A stunt motorcyclist rides his bike inside a futuristic rotating space station—a giant rotating donut-shaped structure in space. The normal support force feels like weight to him. As he rides his bike in the opposite direction to the station’s rotation, the normal force

a. remains unaffected.

b. increases.
c. decreases.

PT 2:

1. A 6 kg ball is thrown with 24 kg·m/s of momentum. What is the ball’s velocity?

A. 4 m/s
b. 9.8 m/s
c. 10 m/s
d. 24 m/s

7. If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would increase because

A. its mass is closer to its center of rotational axis.
b. its mass is farther from its center of rotational axis.
c. its mass has increased.
d. its mass has decreased.

Sue can easily lift a rock with the help of a lever. When she pushes down with 20.0 N of force, she lifts the rock 0.3 meters and she moves her arms 0.675 m. What is the net force of the rock?

A. 10.0 N
b. 20.0 N
c. 30.0 N
d. 45.0 N

A game room in a rotating space habitat is located in a 0.25 g region. If a person can jump 0.5 m high in a 1 g region, how high can the same person jump in the game room?

A. 0.5 m
b. 2m
c. 4m
d. 8m

A rock and a rubber ball have the same mass. If you drop them both from the top of a 3-story building, which object will produce a lesser impulse?

A. The rock will produce a lesser impulse because it will dent the surface it hits.
b. The rock will produce a lesser impulse because it will not bounce as high as the ball when it hits the ground.
c. The rubber ball will produce a lesser impulse because it will bounce higher.
d. The rubber ball will produce a lesser impulse because it will stop when it hits the ground.

Eval 5:

An observer is moving at 21 the speed of light in a direction perpendicular to a rod of

length L. The observer will measure the length of the rod to be

a. equal to L.
b. less than L.
c. greater than L.

d. zero.

23. The reason the moon does not fall into the Earth is that

a. Earth’s gravitational field at the moon is weak.
b. the moon has a sufficiently large tangential velocity.

c. gravitational pull of other planets keeps the moon up.

d. the moon has less mass than Earth.
e. none of the above are true.

PT 3:

Two objects move toward each other because of a gravitational attraction which depends upon

A. the distance between their centers.
b. the objects densities.
c. the objects volumes.
d. magnetic relativity.

Compounds are made of molecules.

A. This is always false.
b. This is always true.
c. This is sometimes true.
d. Only at ordinary temperatures.

If the linear dimensions of a wooden bridge are scaled up 100 times, its strength will increase by ___________, and its weight will increase by _______________.

A. 100, 1000.
b. 1000, 100.
c. 100, 100.
d. 10,000; 1,000,000.

Which of the following is a compound?

A. ocean water
b. air
c. ammonia
d. mud

Which has more density, 5 boxes of pineapples or 10 boxes of pineapples?

A. They both have the same density.
b. 10 boxes of pineapples have more density.
c. 5 boxes of pineapples have more density.

You are communicating with aliens on Jupiter and Saturn. When you send a light beam message to your friend on Jupiter and receive a message from your friend on Saturn, you realize that the light messages became curved when they passed by the sun. The sum of the angles in the triangle formed by the paths your messages take is larger than 180 degrees due to the

A. flat plane of the solar system.
b. Euclidean geometry of the solar system.
c. 4 dimensional geometry of the solar system.
d. mass of the sun has no affect on the light messages.

A 2 ton dirigible hovers in the air. The buoyant force acting on it is

A. zero.
b. the weight of the air displaced by the dirigible.
c. the volume of the air displaced by the dirigible.
d. more than 2 tons.

In a hydraulic press operation, a force output can exceed the force input when

A. output force is increased and output displacement is decreased.
b. output displacement equals the input displacement.
c. energy output exceeds the energy input.
d. force and distance are both increased.

Both gases and liquids

A. will fill up all the space in a container.
b. are fluids.
c. have molecules in constant contact.
d. will have collisions between their molecules.

A hydraulic press works because

A. liquids transmit pressure in one direction.
b. the pistons are the same size.
c. Pascal’s principle is operating.
d. liquids transmit pressure inversely.

Einstein did reasoned that motion can be detected even in empty space.

A. True

B. False

A bubble of carbon dioxide released from the bottom of a lake

A. becomes denser as it rises.
b. follows Boyles Law.
c. demonstrates the proportional relationship between pressure and volume.
d. will decrease in volume as pressure decreases.

Which has the smallest surface area per volume?

A. a cube
b. a pancake
c. a sphere
d. a teardrop

The density of silver is 10.5 g/cm3. The density of gold is 19.3 g/cm3. Which has the greater density, 10 kg of silver or 5 kg of gold?

A. the gold
b. the silver
c. They both have the same density.
d. It depends on their volume.