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The motor of an engine is rotating abou...

The motor of an engine is rotating about its axis with an angular velcoity of `100 rev min^(-1)` . It comes to rest in 15 s, after being switched off. Assuming constant angualar decelearation . What are the numbers of revolutions made by it befor coming to rest ?

A

12.5

B

40

C

32.6

D

15.6

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SL ARORA-System of particles & rotational Motion-EXERCISE
  1. A disc, initially at rest, starts rotating about its own axis/ with a ...

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  2. A car is moving at a speed of 72 km//h. The diameter of its wheels is ...

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  3. The motor of an engine is rotating about its axis with an angular ...

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  4. Angular acceleration alpha of a body is given by the relation a = 4at^...

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  5. The front wheel on an ancient bicycle has radius 0.5 m. It moves with ...

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  6. A ring of radius R is first rotated with an angular velocity omega and...

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  7. Which one is a vector quantity?

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  8. If force vector is along X-axis and radius vector is along Y-axis then...

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  9. Find the torque of a force vecF= -3hati+hatj+5hatk acting at the poin...

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  10. If force acts on a body, whose line of action does not pass through it...

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  11. Can the couple acting on a rigid body produce translatory motion ?

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  12. In order to balance a see-saw of total length 10.0m, two kids weighing...

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  13. a uniform beam, of length L and mass m = 1.8 kg, is at rest on two sca...

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  14. An automobile engine develops 100 kW when rotating at a speed of 1800 ...

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  15. Angular momentum is

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  16. Which is a vector quantity

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  17. Dimensions of angular momentum are

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  18. Joule-second is the unit of

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  19. Under a constant torque, the angular momentum of a body changes from A...

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  20. A particle of mass m is rotating in a plane in circular path of radius...

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