Chapter Pretests


Chapter 5 Quiz
 
Name: 
 

Chapter 5 Quiz



Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

A worker pushes a wheelbarrow with a force of 40 N over a level distance of 6.0 m. If a frictional force of 24 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow?
a.
240 J
b.
216 J
c.
144 J
d.
96 J
e.
75 J
 

 2. 

What is the kinetic energy of a 0.135-kg baseball thrown at 40.0 m/s (90.0 mph)?
a.
54.0 J
b.
87.0 J
c.
108 J
d.
216 J
e.
256 J
 

 3. 

What is the minimum amount of energy required for an 80-kg climber carrying a 20-kg pack to climb Mt. Everest, 8 850 m high?
a.
8.67 MJ
b.
4.16 MJ
c.
2.47 MJ
d.
1.00 MJ
e.
0.872 MJ
 

 4. 

As an object is lowered into a deep hole in the surface of the earth, which of the following must be assumed in regard to its potential energy?
a.
increase
b.
decrease
c.
remain constant
d.
cannot tell from the information given
e.
increases up to the maximum and then remains constant
 

 5. 

Samantha pushes a 50-N crate up a ramp 25.0 m in length and inclined at 10° with the horizontal. What potential energy change does the crate experience?
a.
13 J
b.
55 J
c.
120 J
d.
220 J
e.
280 J
 

 6. 

An amount of work equal to 1.5 J is required to compress the spring in a spring-gun. What is the "launch speed" of a 15-g marble?
a.
14 m/s
b.
15 m/s
c.
18 m/s
d.
21 m/s
e.
23 m/s
 

 7. 

A Hooke's law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of the spring would result in the mass attaining double the speed received in the above situation?
a.
1.41 d
b.
1.73 d
c.
2.00 d
d.
4.00 d
e.
5.35 d
 

 8. 

Adisa pulls a 40-N crate up a 5.0-m long inclined plane at a constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there is a constant force of friction of 10 N between the crate and the surface, what is the net change in potential energy of the crate?
a.
120 J
b.
-120 J
c.
200 J
d.
-200 J
e.
140 J
 

 9. 

A parachutist of mass 50.0 kg jumps out of an airplane at a height of 1 000 m. The parachute deploys, and she lands on the ground with a speed of 5.0 m/s. How much energy was lost to air friction during this jump?
a.
49 400 J
b.
98 700 J
c.
198 000 J
d.
489 000 J
e.
534 000 J
 

 10. 

The unit of power, watt, is dimensionally the same as:
a.
joule-second.
b.
joule/second.
c.
joule-meter.
d.
joule/meter.
e.
joule-kilogram.
 

 11. 

A 60-kg woman runs up a flight of stairs having a rise of 4.0 m in a time of 4.2 s. What average power did she supply?
a.
380 W
b.
560 W
c.
620 W
d.
670 W
e.
730 W
 

 12. 

Yuri, a Russian weightlifter, is able to lift 250 kg 2.00 m in 2.00 s. What is his power output?
a.
500 W
b.
2.45 kW
c.
4.90 kW
d.
9.80 kW
e.
10.0 kW
 

 13. 

A speed boat requires 80 kW to move at a constant speed of 15 m/s. What is the resistive force of the water at this speed?
a.
2 700 N
b.
5 300 N
c.
6 500 N
d.
7 700 N
e.
8 400 N
 

 14. 

A 1 000-kg sports car accelerates from zero to 25 m/s in 7.5 s. What is the average power delivered by the automobile engine?
a.
20.8 kW
b.
30.3 kW
c.
41.7 kW
d.
52.4 kW
e.
67.8 kW
 

 15. 

A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a.
remains the same.
b.
increases.
c.
decreases.
d.
doubles every 4.0 seconds.
e.
halves every 4.0 seconds.
 



 
Check Your Work     Start Over