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Question
A mechanic unscrew a nut by applying a force of 140 N with a spanner of length 40 cm. What should be the length of the spanner if a force of 40 N is applied to unscrew the same nut?
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Solution
Given F1 = 140 N, d1 = 40 cm, F2 = 40 N, d2 = ?
In, both the cases, moment of forces applied are equal
F1d1 = F2d2
d2 = `("F"_1/"F"_2)` d1
d2 = 40 × `140/40` = 140cm
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