((QUESTION 1)) (a) A windlass has a drum of 15 cm diameter and a crank 50 cm lon

Question

((QUESTION 1))

(a)

A windlass has a drum of 15 cm diameter and a crank 50 cm long. A man pulls up a bucket of concrete weighing 934 N. What force must be exerted on the crank if the device is 90% efficient?

(b)

A 300 N weight is lifted by the pulley system. If it is 85% efficient, how much force must be applied?

(c)

If a 20 N force is needed to lift a 200 N weight using a 30 m length lever having a 95% efficiency, how far from the weight must the fulcrum be placed?

Explanation / Answer

Part A)

eff = Wout/Win

.90 = (934)(7.5)/F(25)

F = 311.3 (The last choice)

Part B)

What pulley system. This really depends on a lot of information that you didn't provide. Do you have a picture that you forgot to include. This can't be answered with the information given.

Part C)

.95 = Wout/Win

.95 = 200(x)/20(30 - x)

570 - 19x = 200x

570 = 219x

x = 2.61 m (The first choice)

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