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3. Jack & Jill went up the hill to fetch a pail of water. At the well, Jill used a force
of 20.0 N to turn the crank handle of radius 0.400 m to rotate the axle of radius
0.100 m, so she could raise the 60.0 N bucket of water. A) What is the ideal
mechanical advantage of the wheel? B) What is the actual mechanical advantage
of the wheel? C) What is the efficiency of the wheel?

Respuesta :

i think its c because it says the efficiency of the wheel

The ideal mechanical advantage, actual mechanical advantage and efficiency of the wheel are respectively; 4, 3 and 75%

What is the mechanical advantage?

We are given;

Radius of crank handle; r_c = 0.4 m

Radius of axle; r_a = 0.1 m

Load = 60 N

Effort = 20 N

A) Formula for ideal mechanical advantage is;

IMA = 2πr_c/2πr_a

IMA = 0.4/0.1

IMA = 4

B) Actual mechanical advantage is;

AMA = 60/20

AMA = 3

C) Efficiency is gotten from the formula;

Efficiency = AMA/IMA * 100%

Efficiency = (3/4) * 100%

Efficiency = 75%

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