A wrench with a length of #40 cm# is being used to unscrew a #4 cm# bolt. If a torque of #15 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?

Answer 1

Torque (Nm) = Force (N) x distance (m) & the trick is to remember that you have to convert the distance into metres first.

Though, in my opinion, the proper question should be, "What is the minimum force that should be applied?"

The force can be calculated by dividing the necessary torque (15 Nm) by the 0.4 m distance.

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Answer 2

Parker Abbott

The minimum torque required to unscrew the bolt is 150 Nm.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.