Answer :
The gravitational torque on your arm in this position around the shoulder joint is mgL/2.
What is torque?
The force that can cause an object to rotate along an axis is measured as torque. An object acquires angular acceleration due to torque.
A vector quantity is a torque. The force acting on the axis determines the direction of the torque vector.
Let the mass of your arm = m.
Length of your arm = L.
If the hand has uniform mass, the position of its center of gravity during it is horizontal is = L/2.
Hence, the torque on your arm in this position around the shoulder joint be =
weight of your hand × the position of its center of gravity with respect to shoulder
= mgL/2
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