15. Define centripetal acceleration. Give its direction. Write the 3 expression for the centripetal acceleration. If the time period of
rotation of a body in a circular path is increased by three times then
what is the effect on the centripetal .

Ans 1 :Centripetal acceleration, property of the motion of a body traversing a circular path.

Ans 2 :The acceleration is directed radially toward the centre of the circle and has a magnitude equal to the square of the body's speed along the curve divided by the distance from the centre of the circle to the moving body

Ans 3 :We can express the magnitude of centripetal acceleration using either of two equations: ac=v2r;ac=rω2 a c = v 2 r ; a c = r ω 2

Ans 4 :The angular speed along a given circular path is inversely proportional to time of revolution,so if the time of revolution is increased by 3 times then the angular speed becomes 1/3 rd

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b.a device that inputs heat into a cool object