An outstretched arm is holding an apple with a mass of
150 g, as shown in the figure above. The arm is 30 degrees below
the
horizontal, and the apple is held 27 cm from the shoulder joint.
What is the torque around the shoulder joint caused by the apple?
(answer is in Nm)
Homework Answers
The torque is given by
T= F * r * sin x
Here, x is the angle between the force acting and the distance from the point.
30 + x = 90
x = 90 - 30 = 60
So T = ( 0.150 * 9.8 ) * 0.27 * sin 60 = 1.27 N-m
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