A fan makes 2400 rpm. If after it is switched off, it comes to rest in 10 s, then find the number of times it will rotate before it comes to rest after it is switched off.

Why a fan continues to rotate for sometime even after it is switched off ?

Why a fan continues to rotate for sometime even after it is switched off ?

Why does the electric fan continue to rotate for some time after the current is switched off ?

Stirred liquid comes to rest after some time. Why?

Why do blades of an electric fan continue to rotate for some time, after the current is switched off ?

Why do the blades of an electric fan continue to ratate for some time after the current is switched off

A stirred liquid comes to rest after sometime. Why?

A non-conducting ring of mass m and radius R has a charge Q uniformly distributed over its circumference. The ring is placed on a rough horizontal surface such that plane of the ring is parallel to the surface. A vertical magnetic field B = B_0t^2 tesla is switched on. After 2 a from switching on the magnetic field the ring is just about to rotate about vertical axis through its centre. (a) Find friction coefficient mu between the ring and the surface. (b) If magnetic field is switched off after 4 s , then find the angle rotated by the ring before coming to stop after switching off the magnetic field.