Download MC answer key for exam2

exam2 ph201 2007 Key
Version #1
1.
A 20 N horizontal force is applied to a 4.0 kg box. The box moves a horizontal distance of 3.0
meters. The work done by the 20 N force is:
A
b.
c.
d.
e.
60 J.
80 J.
10 J.
92 J.
65 J.
Giambattista - 006 Conservation... #1
2.
A spring is stretched from 0.500 m to 0.800 m. Assume the un-stretched position is 0.00 m. If the
spring constant of the spring is 10.0 N/m, what is the work done on the spring?
A
b.
c.
d.
e.
1.95 J
2.21 J
2.45 J
2.75 J
3.01 J
Giambattista - 006 Conservation... #17
3.
A ball collides with a second ball at rest. After the collision, the first ball comes to rest and the
second ball moves off at the speed of the first ball. In this collision:
a.
b.
c.
d.
E
total momentum is not conserved.
total kinetic energy is not conserved.
total momentum is conserved but total kinetic energy is not conserved.
total momentum is not conserved but total kinetic energy is conserved.
total momentum and total kinetic energy are conserved and the masses are equal.
Giambattista - 007 Linear... #54
1
4.
Two objects collide and stick together. Which of the following is false?
a.
b.
C
d.
Momentum is conserved.
Kinetic energy is lost.
Kinetic energy is conserved.
Momentum is lost.
Giambattista - 007 Linear... #69
5.
A 2.0 kg ball is moving at 4.0 m/s WEST. The momentum of the ball is:
a.
b.
C
d.
e.
4.00 kg•m/s WEST.
6.00 kg•m/s WEST.
8.0 kg•m/s WEST.
10 kg•m/s WEST.
12 kg•m/s WEST.
Giambattista - 007 Linear... #2
6.
A water hose has a flow rate of 3.0 kg/s of water. If the velocity of the water as it leaves the hose is 5.
0 m/s, then the force to hold the hose is:
A
b.
c.
d.
e.
15 N.
26 N.
30 N.
45 N.
57 N.
Giambattista - 007 Linear... #36
7.
Two objects of equal mass hit a wall with the same velocity. They both rebound with the same
velocity. Both objects experience the same momentum change but one experiences twice the force as
the other. Which of the following statements is true?
A
b.
c.
d.
e.
The contact time between the object and the wall of one is twice the contact time of the other
The contact time between the object and the wall of one is equal to the contact time of the other
The contact time between the object and the wall of one is one half the contact time of the other
The change in the kinetic energy is the same for the two objects.
The contact time between the object and the wall of one is 1/3 the contact time of the other
Giambattista - 007 Linear... #61
2
8.
In any collision:
a.
b.
C
d.
e.
total momentum is not conserved.
total kinetic energy is conserved.
total momentum is conserved.
total momentum is not conserved but total kinetic energy is conserved.
total momentum and total kinetic energy are conserved and the masses are equal.
Giambattista - 007 Linear... #55
9.
A student lifts a weight of 10.0 N a distance of 0.5 meters. If this exercise is repeated 50 times in 100
seconds, then the power of this exercise is:
A
b.
c.
d.
e.
2.5 Watts.
3.1 Watts.
3.6 Watts.
4.0 Watts.
4.8 Watts.
Giambattista - 006 Conservation... #37
10.
If the momentum of a ball is doubled, then the kinetic energy is:
a.
b.
c.
D
e.
0.5 times larger.
2 times larger.
3 times larger.
4 times larger.
5 times larger.
Giambattista - 007 Linear... #6
11.
As a hiker descends a hill, the work done by gravity on the hiker is:
a.
b.
C
d.
positive and depends on the path taken.
negative and depends on the path taken.
positive and independent of the path taken.
negative and independent of the path taken.
Giambattista - 006 Conservation... #10
3
12.
The graph shows the force on an object as it moves a distance x. What is the work done by the force
when the object moves from 0.0 m to 4.0 m?
a.
B
c.
d.
e.
6.0 J
8.0 J
10 J
12 J
14 J
Giambattista - 006 Conservation... #13
13.
A 75.0 kg skier slides down a 75.0 m high slope without friction. The velocity of the skier at the
bottom of the slope is:
a.
b.
C
d.
e.
20.6 m/s.
29.7 m/s.
38.3 m/s.
40.5 m/s.
50.0 m/s
Giambattista - 006 Conservation... #68
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Giambattista - 007 Linear...
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