Question

a mechanic unscrew a nut by applying a force of 30n with spanner of length 60cm.what should be the length of spanner if a force of 10 n is applied to the unscrew the same nut ?
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Answer 1

τ=force×⊥distance

τ=20×0.5

τ=10N−m

(2) τ=force×distance

τ=5×

100

10

τ=0.5N−m