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A string of negligible thicknes is wrapp...

A string of negligible thicknes is wrapped several times around a cylinder kept on a rough horizontal surface. A man standing at a distance l from the cylinder holds one end of the sitting an pulls the cylinder towards him figure. There is no slipping anywhere. The length of the string passed through the hand of the man whicle the cylinder reaches his hands is

A

l

B

2l

C

3l

D

4l

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The correct Answer is:
B
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HC VERMA-ROTATIONAL MECHANICS-Objective 1
  1. A body is rotating anonuniformly abut a vertical axis fixed in an iner...

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  2. Let vecF be the force acitng on a paritcle having positon vector vecr...

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  3. One end of a uniform rod of mas m and length l is clamped. The rod lie...

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  4. A uniform rod is kept vertically on a horizontally smooth surface at ...

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  5. A circular disc A of radius r is made from an iron plate of thickness ...

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  6. Equal torques asct on the discs A and B of theh previous problem, init...

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  7. A closed cylindrica tube containing some water (not filling the entire...

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  8. The moment of inertias of a unifrom semicircular wire of mss M and rad...

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  9. Let I1 and I2 be the moments of inertia of two bodies of identical ge...

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  10. A body having its centre of mass at the origin has three of its partic...

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  11. A cubical block of mass M and edge a slides down a rougg inclined plan...

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  12. A thin circular ring of mass M and radius r is rotating about its ais ...

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  13. A man is sitting on a rotating stool with his arms outstretched. If su...

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  14. The centre of a wheel rolling on a plaen surface moves with a speed v0...

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  15. A wheel of radius 20 cm is pushed ot move it on a rough horizontal sur...

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  16. The angular velocity of the engine (and hence of the wheel) on a scoot...

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  17. A solid sphere a hollow sphere and a disc all having same mass and rad...

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  18. A solid sphere, a ring and a disc all having same mass and radius are ...

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  19. In the previous question the smallest kinetic energy at the bottom of ...

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  20. A string of negligible thicknes is wrapped several times around a cyli...

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