A plate of mass `m`, length b, and breadth a is initially lying on a horizontal floor with length parallel to the floor and breath perpendicular to the floor. Find the work done to erect it on its breadth.

A stationary uniform rod of mass 'm', length 'l' leans against a smooth vertical wall making an angle theta with horizontal floor. Find the normal force & frictional force that is exerted by the floor on the rod ?

A meter scale of mass 400 gm is lying horizontally on the floor. If it is to be held vertically with one end touching the floor, the work to be done is

The length, breadth and height of the hall is 14m, 9m and 7m respectively. Find the area of the floor

A bicycle chain of length 1.6 m and of mass 1 kg is lying on a horizontal floor. If g = 10 ms^(-2) , the work done in lifting it with one end touching the floor and the other end 1.6 m above the floor is

A particle of mass m strikes a horizontal smooth floor with velocity u making an angle theta with the floor and rebound with velocity v making an angle theta with the floor. The coefficient of restitution between the particle and the floor is e . Then