QUESTION: 53

Wheel A has a diameter of 10 feet. Wheel B has a diameter of 8 feet.
If both wheels revolve at the same rate, Wheel B will cover a linear distance of 16 feet ___________.

at the same time as Wheel A
more slowly than Wheel A
in twice the time as Wheel A
faster than Wheel A

Answer(s): B

Explanation:

Wheel B has to make more revolutions than Wheel A to cover the same amount of distance, so it will go slower.

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QUESTION: 54

What effort must be used to lift a 30-pound cat (see the figure above) using a first-class lever? (Don’t include the weight of the lever in your calculations.)

10 pounds
15 pounds
50 pounds
5 pounds

Answer(s): A

Explanation:

E stands for effort needed. 30 (weight of the cat) × 2 (length of resistance arm) = x × 6 (length of effort arm).

Do a little multiplication, and you get 60 = 6x. To isolate x, divide each side by 6:
60 ÷ 6 = 6x ÷ 6, or 10 = x.

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QUESTION: 55

What mechanical advantage does the block and tackle arrangement in the above figure give?

1
3
2
4

Answer(s): A

Explanation:

A fixed, simple pulley gives no mechanical advantage, so its mechanical-advantage number is 1.

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QUESTION: 56

If a ramp is 8-feet long and 4-feet high, how much effort is required to move a 400-pound object up the ramp?

35 pounds
150 pounds
800 pounds
200 pounds

Answer(s): D

Explanation:

The formula to determine the mechanical advantage of an incline plane is Length of Ramp ÷ Height of Ramp = Weight of Object ÷ Effort. 8 ÷ 4 = 400 ÷ E
8⁄4 = 400⁄E
8E = 1,600
8E⁄8 = 1,600⁄8
E = 200

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Free ASVAB Section 3: Mechanical Comprehension Exam Braindumps (page: 15)

QUESTION: 53

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QUESTION: 54

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QUESTION: 55

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QUESTION: 56

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