Question

A rod of mass 'm' and length 'l' is made to stand at an angle of 60° with the vertical. Potential energy of the rod in this position is:-

Answer 1

hope it will help you.

Answer 2

Potential energy of the rod is mgl/4

Potential energy is defined by its position or as mechanical energy. For example, the energy that a ball has when perched on the top of a steep hill while it is about to roll down.

Mass of the rod = m (Given)

Length of the rod = l (Given)

Vertical angle = 60° (Given)

x = 1/2 cos 60°

= l/4

Potential energy = PE = mgx, where m is the total mass in kilograms,  h is the height in meters and  g is the acceleration due to gravity.

= mgl/4

Thus, the potential energy of the rod in this position is mgl/4.