An object with a mass of $3 kg$ is hanging from an axle with a radius of $2 cm$ . If the wheel attached to the axle has a radius of $15 cm$ , how much work would it take to turn the wheel a length equal to the circumference of the axle?

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Answer 1 · 2017-10-30T12:22:57

The work is $=3.69J$

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The load is $L=3gN$

The radius of the axle is $r=0.02m$

The radius of the wheel is $R=0.15m$

The effort is $=FN$

The acceleration due to gravity is $g=9.8ms^-2$

Taking moments about the center of the axle

$F*0.15=3g*0.02$

$F=3g*0.02/0.15=3.92N$

The force is $F=3.92N$

The distance is $d=2piR=2pi*0.15=0.3pim$

The work is $W=Fd=3.92*0.3pi=3.69J$

An object with a mass of 3 kg3 kg is hanging from an axle with a radius of 2 cm2 cm. If the wheel attached to the axle has a radius of 15 cm15 cm, how much work would it take to turn the wheel a length equal to the circumference of the axle?