An object with a mass of $4 kg$ is hanging from an axle with a radius of $9 m$ . If the wheel attached to the axle has a radius of $7 m$ , how much force is needed to raise the object?

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Answer 1 · 2017-07-23T14:10:47

The force is $=50.4N$

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The load $L=(4g)N$

Radius of axle $r=9m$

Radius of wheel $R=7m$

Taking moments about the center of the axle

$F*R=L*r$

$F*7=4g*9$

$F=(4*g*9)/7=50.4N$

The force is $F=50.4N$

An object with a mass of 4 kg4 kg is hanging from an axle with a radius of 9 m9 m. If the wheel attached to the axle has a radius of 7 m7 m, how much force is needed to raise the object?