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The radius of a wheel is 30.0 cm and that of its axle is ...

The radius of a wheel is 30.0 cm and that of its axle is 6.0cm. Calculate the effort required to lift a load of 120.0N using this machine. Assuming 100% efficiency

A.

600.0N

B.

40.0N

C.

24.0N

D.

20.0N

Correct answer is C

V.R = Rr=306=5

γ=M.AV.R×1001

M.A = 100×5100=5

Effort = LM.A=1205

= 24N