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A pulley os radius 2m is rotated about i...

A pulley os radius 2m is rotated about its axis by a force `F= (20 t- 5t^2)` newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is `10kg m^2` the number of rotaitons made by the pulley before its direction of motion is reversed, is:

A

more than 3 but less than 6

B

more than 6 but less than 9

C

more than 9

D

less than 3

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The correct Answer is:
A
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MOTION-ROTATIONAL MOTION -Exercise - 3 ( Section-B )
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  8. A thin uniform rod of length l and mass m is swinging freely about a h...

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  9. A pulley os radius 2m is rotated about its axis by a force F= (20 t- ...

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  10. A thin horizontal circular disc is roating about a vertical axis passi...

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  11. A hoop of radius r and mass m rotating with an angular velocity omega0...

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  12. A bob of mass m attached to an inextensible string of length I is susp...

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  13. A mass 'm' is supported by a massless string wound around a uniform ho...

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  15. From a solid sphere of M and radius R a cube of maximum possible volu...

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  16. A roller is made by joining together two cones at their vertices O, ti...

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  17. The moment of inertia of a uniform cylinder of length l and radius R a...

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  18. A slender uniform rod of mass M and length l is pivoted at one end so ...

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  19. Seven identical circular planar disks, each of mass M and radius R are...

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  20. From a circular disc of radius R and mass 9 M , a small disc of radius...

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