Chapter 9 Engineering Fundamentals:
An Introduction to Engineering
1. Mass is a fundamental dimension.
a. True
b. False
2. Which of the following statements best describes what mass is?
a. Mass is the amount of space something occupies.
b. Mass is resistance to acceleration.
c. Mass describes how heavy something is.
d. Mass describes how massive something is.
Analysis:
3. Which of the following is the SI unit for mass?
a. kilogram
b. milligram
c. gram
d. slug
Analysis:
4. A measure of how hard it is to rotate something with respect to its center of rotation is called
Engineering Fundamentals, 5th ed. Chapter 9
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Analysis:
5. Momentum is a fundamental dimension.
a. True
6. The ratio of an object’s mass to its volume is
a. density.
b. specific volume.
c. specific gravity.
d. specific weight.
Analysis:
7. Density is a fundamental dimension.
a. True
8. The SI unit for density is
a.
3
cm
g
b.
ml
g
Engineering Fundamentals, 5th ed. Chapter 9
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c.
liter
kg
d.
3
m
kg
Analysis:
9. The ratio of an object’s volume to its mass is
a. density.
b. specific volume.
c. specific gravity.
d. specific weight.
Analysis:
10. Specific volume is a fundamental dimension.
a. True
b. False
11. The SI unit for specific volume is
a.
3
cm
g
b.
g
ml
c.
liter
kg
Engineering Fundamentals, 5th ed. Chapter 9
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d.
kg
m3
Analysis:
12. The ratio of an object’s density to the density of water is
a. density.
b. specific volume.
c. specific gravity.
d. specific weight.
13. Specific gravity is a fundamental dimension.
a. True
b. False
14. The SI unit for specific gravity is
a.
3
cm
g
b.
ml
g
c.
3
m
kg
d. unitless
Engineering Fundamentals, 5th ed. Chapter 9
Saeed Moaveni
Analysis:
15. The ratio of an object’s weight to its volume is
a. density.
b. specific volume.
c. specific gravity.
d. specific weight.
Analysis:
16. Specific weight is a fundamental dimension.
a. True
b. False
17. The SI unit for specific weight is
a. N/m3
b.
c. Newtons
d. unitless
Analysis:
Engineering Fundamentals, 5th ed. Chapter 9
Saeed Moaveni
18. What is the momentum of a
kg2
hockey puck that slides at
s
m
20
across an icy lake?
a.
s
mkg
1.0
b.
s
mkg
10
c.
s
mkg
40
d. None of the above
Analysis:
19. A rectangular block of aluminum has the following dimensions:
“6“1“1
. The density of
aluminum is
3
2700 m
kg
. How much does the block of aluminum weigh?
a.
N5.2
b.
N5
c.
N5.7
d.
N10
Analysis:
20. What happens to the volume of a marshmallow when you squeeze it?
a. Increases
b. Decreases
c. Remains constant
Engineering Fundamentals, 5th ed. Chapter 9
Saeed Moaveni
Analysis:
21. What happens to the mass of a marshmallow when you squeeze it?
a. Increases
b. Decreases
c. Remains constant
Analysis:
22. What happens to the density of a marshmallow when you squeeze it?
a. Increases
b. Decreases
c. Remains constant
Analysis:
23. The Earth has a mass of
kg
24
1098.5
and an average radius of
m
6
1037.6
. What is the
density of the Earth?
a.
3
3500 m
kg
b.
3
5500 m
kg
c.
3
7500 m
kg
d.
3
10000 m
kg
Engineering Fundamentals, 5th ed. Chapter 9
Saeed Moaveni
Analysis:
24. Which has the greater momentum: a motorcycle that weight 500 Newtons moving at a speed
of 100 m/s, or a bullet that weighs 5 millinewtons moving at a speed of
s
m
900
.
a. Car
b. Bullet
c. Both the same
Analysis:
25. A truck and a motorcycle are moving with the same momentum. Which has the greater
kinetic energy?
a. Truck
b. Motorcycle
Analysis:
26. The amount of mass that flows through something per unit of time is called
a. mass moment of inertia.
b. volumetric flow rate.
c. mass flow rate.
d. none of the above.
Analysis:
Engineering Fundamentals, 5th ed. Chapter 9
Saeed Moaveni
27. Mass flow rate is a fundamental dimension.
a. True
b. False
28. What does I stand for in the following equation?
dmrI 2
a. Inertia
b. Intensity
c. Inductance
d. Internal volume
Analysis:
29. Inertia is a fundamental dimension.
a. True
b. False
30. What does L stand for in the following equation?
mvL
a. Length
b. Inertia
c. Momentum
d. Torque
31. Which has more influence on a moving object’s momentum?
a. object’s mass
b. object’s velocity
c. both mass and velocity
d. none of the above
Analysis:
32. The physical quantity of momentum is a vector quantity (has direction).
33. The physical quantity of momentum has
a. magnitude only.
b. direction only.
c. both magnitude and direction.
d. neither magnitude nor direction.
Engineering Fundamentals, 5th ed. Chapter 9
Saeed Moaveni
34. The SI unit for momentum is
a.
s
m
b.
2
s
m
c.
2
s
mkg
d.
s
mkg
Analysis:
35. A block of unknown metal has the following dimensions:
cmcmcm 311
. The block’s
mass is
g27
. What is the density of the block?
a.
3
9m
kg
b.
3
90 m
kg
c.
3
900 m
kg
d.
3
9000 m
kg
Analysis:
36. A block of unknown metal has the following dimensions:
cmcmcm 311
. The block’s
density is
3
8000 m
kg
. What is the mass of the block?
a.
g24
b.
c.
kg4.2
d.
kg24
Analysis:
37. An aluminum cylinder is
cm5
long and has a mass of
g42
. If aluminum has a density of
3
2700 m
kg
, how long is the cylinder?
a.
cm1
b.
cm2
c.
cm3
d.
cm4
Analysis:
38. While filling up your car with gasoline, you notice that it takes 2 minutes to dispense 15
gallons of gasoline. What is the mass flow rate if water has a density of
3
1000 m
kg
and gasoline
has a specific gravity of 0.72?
a.
sec
4.3 kg
b.
sec
34.0 kg
c.
sec
54kg
Engineering Fundamentals, 5th ed. Chapter 9
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d.
sec
5400kg
Analysis:
39. It takes 20 seconds to fill a two-liter bottle with water from your kitchen faucet. What is the
mass flow rate from the faucet if water has a density of
3
1000 m
kg
?
a.
sec
1kg
b.
sec
1.0 kg
c.
sec
01.0 kg
d.
sec
1g
Analysis:
40. A roll of aluminum foil from the grocery store is 12 inches wide by 75 feet long (if you
unroll it). If the foil is 0.006 inches thick, and the specific weight of aluminum is
3
26460 m
N
,
how much does the roll of aluminum foil weigh?
a.
N142884
b.
N4900
c.
N036.0
d.
N28
Analysis:
41. A roll of aluminum foil from the grocery store is 25 centimeters wide by 25 meters long (if
you unroll it). If the foil is 0.1 millimeters thick, and the density of aluminum is
3
2700 m
kg
, what
is the mass of the roll of aluminum foil?
a. 15899 kg
b. 500 kg
c. 1.7 kg
d. .36 kg
Analysis:
42. A roll of aluminum foil from the grocery store is 25 centimeters wide by 25 meters long (if
you unroll it). If the roll of foil has a mass of
kg8.2
and the density of aluminum is
3
2700 m
kg
,
what is the thickness of the aluminum foil?
a. 0.0003 cm
b. 0.0004 cm
c. 0.00017 cm
d. 0.0023 cm
Analysis: