1–59.
1–60.
1–61.
1-62.
The counterclockwise moment about B
is
1.
200 ft–lb
2.
1,200 ft–lb
3.
1,800 ft–lb
4.
3,000 ft–lb
How much of the load is the sailor
at the right carrying?
1.
22 2/9 lb
2.
33 1/3 lb
3.
80 lb
4.
120 lb
The sailor in figure 3-4 in your
textbook can increase his
effectiveness without exerting a
greater effort by using a shorter
capstan bar.
1.
True
2.
False
Which of the parts of figure 1T
represents the wheel and axle
arrangement known as a couple?
1. A
2. B
3. C
1–63.
1-64.
0
A ship’s deck is 24 feet above the
dock.
How long a gangplank is
needed to provide a theoretical
mechanical advantage of 2?
1.
24 ft
2.
48 ft
3.
60 ft
4.
96 ft
A sailor is rolling a 400–pound
barrel up a 20–foot long ramp to a
3-foot height.
Neglecting
friction, the force needed to move
the barrel up the ramp is
1.
60 lb
2.
133 1/3 lb
3.
200 lb
4.
220 lb
When answering questions 1–65
through 1-68, refer to figure 1U.
1–65.
The theoretical mechanical
advantage of the inclined plane is
1.
3/16
2.
3
3.
5 1/3
4.
6
1-66.
Neglecting friction, the force,
needed to pull the crate up the
inclined plane is
1.
50 lb
2.
75 lb
3.
124 lb
4.
600 lb
4. D
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