Multiple-choice Physics Competency Test
To pass this test a score of 80% or higher is needed.
- 1.All of the following require the application of a net force, except?
- A.
To change an object from a state of rest to a state of motion
- B.
To maintain an object in motion at a constant velocity
- C.
To change an objects speed w/out changing its direction of motion
- D.
To maintain an object in uniform circular motion
- E.
To accelerate an object
- 2.A rocket flies at constant velocity straight up. whats the direction of the net force on the rocket?
- A.
Up
- B.
Down
- C.
Can not be determined w/out knowing rocket mass
- D.
Cant be determined w/out knowing the wind resistance
- E.
None of the previous
- 3.A hot rod starting at rest and uniformly accelerating covers a distance of 400 meters in 15 seconds. What is the acceleration to two significant figures?
- A.
3.6 m/s^2
- B.
4.4 m/s^2
- C.
2.2 m/s^2
- D.
27 m/s^2
- E.
None
- 4.A ball is thrown up at 15 m/s, whats the velocity after 3.0 seconds?
- A.
14 m/s up
- B.
14 m/s down
- C.
44 m/s up
- D.
44 m/s down
- E.
None
- 5.A 20.0 kg block on a smooth horizontal surface is acted upon by two horizontal forces: a force of 20 N acting to the left and a force of 60 N to the right? The acceleration fo the block will be
- A.
3.0 m/s^2 to the right
- B.
4.0 m/s^2 to the right
- C.
40 m/s^2 to the right
- D.
2.0 m/s^2 to the left
- E.
None
- 6.Which of the following units would be appropriate to describe force?
- A.
Kg*m/s^2
- B.
M/s^2
- C.
Kg/s
- D.
Kg*m/s
- E.
None
- 7.A 0.15 kg ball traveling with a speed of 50 m/s is brought to rest in a catcher's mitt with an average force of 75 N. What is the maginutde of the impulse exerted by the mitt on the ball?
- A.
75 Ns
- B.
11.3 Ns
- C.
3750 Ns
- D.
7.5 Ns
- E.
None
- 8.A child plays on a see-saw with her father. The child has a weight of 250 N and is seated 2.5 m from the axis of rotation. Her father balances her when he is seated 0.80 m from the axis. The fathers weight is
- A.
250 N
- B.
500 N
- C.
667 N
- D.
725 N
- E.
750 N
- 9.A book weighing 10 N is held at rest in the palm of the hand. The reaction to the force of the hand on the book is a force of
- A.
10 N exerted by the Earth on the book
- B.
10 N exerted by the book on the Earth
- C.
10 N exerted by the book on the hand
- D.
0 N
- E.
9/8 m/s^2 in the downward direction arising from the force of the eart
- 10.A ball is projected upward with an initial velocity of 5 m/s. It will reach its maximum height in approximately
- A.
0.5 s
- B.
1.0 s
- C.
49 s
- D.
2.0 s
- E.
0.0 s
- 11.If an astronaut landed on a planet that was three times the diameter and three times the mass of earth, how would his weight there compare with that on earth?
- A.
Same
- B.
Three times as much
- C.
One ninth as much
- D.
One third as much
- E.
None
- 12.Temperature can be described as
- A.
Heat
- B.
A measure of the average kinetic energy of the molecules of a substance
- C.
A fluid that flows between a hot and cold object
- D.
A physical quantity measured in calories
- E.
Energy transfer as a result of a temperature difference
- 13.A positive charge is released from rest near a bar magnet. The magnetic force on the charge
- A.
Attracts it toward the N pole of the magnet
- B.
Attracts it toward the S pole of the magnet
- C.
Repels it away from the N pole of the magnet
- D.
Repels it away from the S pole of the magnet
- E.
Theres no magnetic force on the charge
- 14.A current of 2.5 A is flowing through a resistance of 18 Ohms. What is the voltage difference across this resistance?
- A.
1.5 V
- B.
6 V
- C.
45 V
- D.
115 V
- E.
None
- 15.If you stand directly in front of a planar (flat) mirror with a distance of 3 feet between you and the mirror, your image appears
- A.
3 feet from you, but changed in size
- B.
3 feet from you, same size
- C.
6 feet from you, but changed in size
- D.
6 feet from you, same size
- E.
At the point where you are standing, same size
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