Question

A massless rod is balanced on a pivot as shown below. If the rod is in static equilibrium, what

magnitude of force (x) must be exerted on the other end of the rod?
A. 7.5 N
B. 13 N
C. 20 N
D. 53 N
E. 80 N

Answer 1

torques must balance for equilibrium

counterclockwise = clockwise

1.5 X = 4 * 20

x = 80 N-m / 1.5 m = 53 N

(D) is correct