A wrench with a length of $24 c m$ $24 cm$ is used to unscrew a $\frac{5}{2} c m$ $5/2 cm$ bolt. If a torque of $5 N m$ $5 Nm$ is needed to overcome the friction keeping the bolt in place, what is the minimum torque that must be applied to the wrench to unscrew the bolt?

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Answer 1 · 2017-11-16T10:48:41

$vec \tau=vec r\timesvec F; \qquad \tau = r.F.sin90^0=r.F$
$r=0.24m; \qquad \tau = 5$ $N.m; \qquad F=\tau/r = 21$ $N$

A wrench with a length of 24 cm24cm24 cm is used to unscrew a 5/2 cm52cm5/2 cm bolt. If a torque of 5 Nm5Nm5 Nm is needed to overcome the friction keeping the bolt in place, what is the minimum torque that must be applied to the wrench to unscrew the bolt?