A woman in la fitness is holding an 8.0-kg weight at arm's length, a distance of 0.55 m from her shoulder joint. what is the torque about her shoulder joint due to the weight if the arm is horizontal?

Torque is equal to force times distance. first calculate the weight of the 8-0 kg weight, using the formula:

F = mg

where g is the accelration due to gravity (9.81 m/s^2)

F = 8 kg (9.81 m / s^2)

F = 78.48 N

and torque = Fl

where l is the distance

t = (78.48 N) (0.55 m)

t = 43.16 Nm is the torque