While doing her crossfit workout, yasmeen holds an 7.0 kg weight at arm's length, a distance of 0.57 m from her shoulder joint. what is the torque about her shoulder joint due to the weight if her arm is horizontal? a 30 n m b. 4.0 n m c. 43n-m d. 39 n m

D. 39 N m

Explanation:

m = mass of the weight used in crossfit workout = 7.0 kg

Force due to the weight used is given as

F = mg

F = (7.0) (9.8)

F = 68.6 N

d = distance of point of action of weight from shoulder joint = 0.57 m

τ = Torque about the shoulder joint due to the weight

Torque about the shoulder joint due to the weight is given as

τ = F d

Inserting the values

τ = (68.6) (0.57)

τ = 39 Nm

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