3. Calculate the work done to move an object of 50g in a circular path of radius 10cm.

Work done in moving an object in circular path is always 0 J

Explanation:

Work doen on any moving object, in general, is given by the following formula:

W = F d Cos θ

where,

W = Work Done

F = Force applied

d = Distance covered

θ = Angle between the direction of motion and the force applied

When the object is moving in a circular path the direction of its motion is always tangential to the circular path. While, the force applied on the object is the centripetal force. And centripetal force is always directed towards the center of the circular path. Therefore, the force and direction of motion are always perpendicular to each other. This means θ = 90°

Therefore,

W = F d Cos 90° = F d (0)

W = 0 J