Question

what is the displacement of a point on the rim of the wheel hinged at its centre as the wheel rotates half a revolution(radius of wheel=R)

Answer 1

Obviously..it moves half a circle..so displacement will be 2R..

Answer 2

Answer:

2R

Explanation:

As the wheel rotates 1/2 a revolution that is; given in picture...... it means that

Imagine the rim.as a circle if there's a point on one end of its circumference and it rotates to 1/ 2 of its circumference it means that the change in the angle is 180° hence the displacement of the point will be equal to the diameter of that circle ( rim ) hence the answer is,

2R

By the way the rim is the outer edge of a wheel holding the tire.

Hope it helped you :-D