a)
Torque about the shoulder
= torque due to the weight of the arm + torque due to the weight of the ball
= 4.5*9.81*(0.60/2) + 3.5*9.81*(0.60) Nm
= 13.24 + 20.6 Nm
= ~ 34 Nm....Answer.
b)
Torque when the arm is at 45° below the horizontal
= 33.841 cos45°
= 24 Nm..... Answer.
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