Question

A person is holding a 5.0 kg mass in one hand as shown in the figure above.

You can ignore the mass of the forearm itself.What is the force exerted by the bicep in order to keep the arm horizontal?(in N to 2s.f)

Answer 1

$M_1=M_2,$

$F_1l_1=mgl_2,$

$F_1=\frac{mgl_2}{l_1}=800~N.$