The function of ball bearings in a wheel is :
1). to increase friction
2). to convert kinetic friction into rolling friction
3). to convert static friction into kinetic friction
4). just for convenience
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1. A current carrying conductor is associated with
2. Energy per unit volume is dimensionally equal to
3. Woollen cloth protects the body from cold because
4. The head mirror used by E.N.T.?doctors is
5. For an object, the state of rest is considered to be the state of ________ speed.
6. X–rays are
7. What type of lens is used in a magnifying glass
8. The unit for measuring electric power is the