Chapter 13 Engineering Fundamentals:
An Introduction to Engineering
1. Energy is a fundamental dimension.
a. True
b. False
2. Power is a fundamental dimension.
a. True
b. False
3. Work is found by multiplying force by what other physical quantity?
a. distance
b. mass
c. power
d. time
4. What is the SI unit for work?
a. Newtons
b. Watts
c. Kelvins
d. Joules
Analysis:
5. What is the SI unit for kinetic energy?
a. Newtons
b. Watts
c. Kelvins
d. Joules
Analysis:
6. How much kinetic energy does a
kg3
soccer ball have while moving at
s
m
20
toward your
opponents’ goal?
a. 60 Joules
b. -60 Joules
c. 600 Joules
d. -600 Joules
Analysis:
7. How much kinetic energy does a
kg3
soccer ball have while moving at
s
m
20
toward a goal?
a. 60 Joules
b. -60 Joules
c. 600 Joules
d. -600 Joules
Analysis:
Engineering Fundamentals, 5th ed. Chapter 13
Saeed Moaveni
8. Which produces the greater change in kinetic energy (assume that all of the work goes into
kinetic energy):
a. exerting a
N10
force for a distance of
m5
b. exerting a force of
N20
over a distance of
m2
c. exerting a
N30
force for a distance of
m5.1
d. exerting a force of
N40
over a distance of
m1
Analysis:
9. Which of the following requires the most work done by the brakes of a car?
a. slowing down from 80 m/s to 55 m/s
b. stopping from 55 m/s
c. equal amounts of work for both
Analysis:
10. A ping pong ball and a bowling ball are moving with the same momentum. Which has the
greater kinetic energy?
a. The ping pong ball
b. The bowling ball
Analysis:
11. The change in gravitational potential energy is found by multiplying an object’s change in
elevation by its
a. mass.
b. weight.
c. density.
d. height.
12. A stone is dropped from a bridge and allowed to free-fall downward. As it falls a certain
distance its gravitational potential energy decreases by
. By how much does the stone’s
kinetic energy increase? (Neglect air resistance).
a.
J100
b.
J500
c.
J1000
d.
J2200
13. What is the SI unit for elastic energy?
a. Newtons
b. Watts
c. Kelvins
d. Joules
Engineering Fundamentals, 5th ed. Chapter 13
Saeed Moaveni
Analysis:
14. In the following equation, what does the k stand for? elastic energy
2
2
1kx
a. kinetic energy
b. spring constant
c. elastic constant
d. momentum
Analysis:
15. In the following equation, what does the x stand for? elastic energy
2
2
1kx
a. deflection of spring from its unstretched position
b. original length of unstretched spring
c. spring force
d. a generic unknown quantity
Analysis:
16. In the absence of heat transfer, and assuming negligible losses and no work, conservation of
mechanical energy states that the total mechanical energy of a system is
Engineering Fundamentals, 5th ed. Chapter 13
Saeed Moaveni
a. increasing
b. constant
c. decreasing
d. decreasing, then constant
Analysis:
17. Thermal energy transfer is called
a. temperature difference.
b. heat difference.
c. temperature flux.
d. heat.
Analysis:
18. What are the SI units for heat?
a. Kelvins
b. Celsius
c. Joules
d. Watts
Analysis:
19. The law that simply states that energy is conserved is
a. the 0th law of thermodynamics.
b. the 1st law of thermodynamics.
c. the 2nd law of thermodynamics.
d. the 3rd law of thermodynamics.
Analysis:
20. Power is found by dividing work by what other physical quantity?
a. distance
b. mass
c. force
d. time
Analysis:
21. The time rate of doing work is called
a. energy
b. power
c. force
d. momentum
Analysis:
22. Power can be described as
a. how hard you push.
b. how fast you push.
c. how far you push.
d. how long you push.
Analysis:
23. The SI unit for power is
a. Watts
b. Joules
c. Newtons
d. Horsepower
Analysis:
24. A team is more powerful than an individual because
a. the team can do more work than the individual in the same amount of time.
b. the team can do the same amount of work as the individual, but in less time.
c. the team can do more work than the individual in less time.
d. All of the above.
Analysis:
Engineering Fundamentals, 5th ed. Chapter 13
Saeed Moaveni
25. In general, efficiency is defined as
a. output divided by input.
b. input divided by output.
c. output multiplied by input.
d. output minus input.
Analysis:
26. The largest source of electric power in the U.S. is
a. solar.
b. natural gas.
c. nuclear.
d. coal.
e. hydroelectric.
f. wind.
Analysis: