An object of mass 1 g is whirled in a horizontal circle of radius 0.5 m at a constant speed of 2 m/s. The work done on the object during one revolution is:

Question

Quizplus · Accepted Answer

The work done on an object is given by the formula:
Work = Force x Distance x cos(theta)
In this case, the force acting on the object is the tension in the string which is always perpendicular to the displacement of the object. Therefore, cos(theta) = 0 and the work done is zero.
Therefore, the correct answer is (A) 0.

An Object of Mass 1 G Is Whirled in a Horizontal