The  7 mm bolt head shown must be tightened to a torque of 420 N-m. Determine the (a) force (N) that delivers this torque if it is applied perpendicular to wrench a distance L = 250 mm.   (b) Assume the wrench has a hexagonal box end and determine the local tangential force (N) applied to each of the six contact points of the box wrench.   (c) Now assume the wrench has an 'open end' as shown below, and determine the local tangential force (N) applied to each of the two contact points.

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.