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(A) : A coin placed on a rotating disc f...

(A) : A coin placed on a rotating disc flies away if the angular velocity is gradually increased
(R ) : Static friciton is self adjusting in nature.

A

Both 'A' and 'R' and true and 'R' is the correct explantation of 'A'

B

Both 'A' and 'R' and true and 'R' is not the correct explantation of 'A'

C

A' is true and 'R' is false

D

A' is false and 'R' is true

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-SYSTEM OF PARTICLES AND ROTATIONAL MOTION-Exercise-I
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  2. (A) : Centripetal force does no work in circular motion. (R ) : Forc...

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  3. (A) : A coin placed on a rotating disc flies away if the angular veloc...

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  4. (A) : The angular momentum of a particle w.r.t origin moving parallel ...

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  5. (A) : If body or a system has neither translational nor rotational mot...

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  6. (A) : A disc released from the top of a fixed inclined plane rolls dow...

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  7. (A) : The centre of mass of a body may lie where there is no mass. (...

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  8. (A): When a shell at rest explodes, the centre of mass fragments Conti...

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  9. (A) : When an electron and proton are released from rest, though they ...

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  10. (A) : At the centre of earth, a body has centre of mass but no centre ...

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  11. (A) : When a body is dropped from a height explodes in mid air, but it...

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  12. (A) : Banking of roads reduces wear and tear of the tyres. (R ) : De...

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  13. (A) : The velocity of a body at the bottom of an inclined plane of giv...

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  14. (A) : The angular velocity of a plantets orbiting around the sun incre...

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  15. (A) : In rolling, all points of a rigid body have the same linear spee...

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  16. (A) : A helicopter must necessarily have two propellers. (R ): Two p...

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  17. (A) : The tendency of skidding or overturning is quardrupled, when a c...

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  18. (A) : A person standing on a rotating platform suddenly stretcehed his...

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  19. (A) : A sphere cannot roll on a smooth inclined surface. (R ) : Fo...

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  20. (A) : To unscrew a rusted nut, we need a wrench with longer arm. (R ...

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