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 #12 cm#, how much work would it take to turn the wheel a length equal to the circumference of the axle?

1 Answer
May 10, 2018

Answer:

The work is #=3.69J#

Explanation:

www.odicis.org

The load is #L=3gN#

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

The radius of the wheel is #R=0.12m#

The effort is #=FN#

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

Taking moments about the center of the axle

#F*0.12=3g*0.02#

#F=(3g*0.02)/0.12=4.9N#

The force is #F=4.9N#

The distance is #d=2piR=2*pi*0.12=0.75m#

The work is

#W=Fxxd=4.9*0.75=3.69J#