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Friction and Vertical Circular Motion Problems

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Question

Mechanical advantage of wheel and axle is: ( $R =$ radius of the wheel, $r$ = radius of the axle)

A

R + r

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B

R / r

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C

r / R

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D

R - r

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Solution

The correct option is A $R / r$
Mechanical advantage is the amplification in force due to the use of a machine . The mechanical advantage of wheel and axle is given by
$M . A . = R / r$

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