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A body rotating with uniform angular acc...

A body rotating with uniform angular acceleration covers `100 pi` (radian) in the first 5 s after the start. Its angular speed at the end of 5 s (in rad/s) is

A

`40pi`

B

`30pi`

C

`20pi`

D

`10pi`

Text Solution

Verified by Experts

The correct Answer is:
A
`theta = 1/2 at^(2) & omega = omega_(0) + alpha t`
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NARAYNA-SYSTEM OF PARTICLES AND ROTATIONAL MOTION -EXERCISE - I (C.W)
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  2. The angular displacement of a particle is given by theta =t^3 + t^2 + ...

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  3. A body rotating with uniform angular acceleration covers 100 pi (radia...

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  4. A body rotates about a fixed axis with an angular acceleration of 3 ra...

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  5. A wheel starts from rest and acquires an angular velocity of 60 rad//...

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  6. Two moving particles P and Q are 10 apart at any point . Velocity o...

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  7. Two particle move in concentio cireles of radii r(1) and r(2) such tha...

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  8. A stationary wheel starts rotating about its own axis at uniform rate ...

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  9. A table fan , rotating at a speed of 2400 rpm is switched off and th...

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  10. If vec(F) = 2hat(i) - 3hat(j) N and vec(r ) = 3hat(i) + 2hat(j) m t...

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  11. A door 1.6 m wide requires a force of 1 N to be applied at the free an...

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  12. A weightless rod is acted on by upward parallel forces of 2 N and 4N e...

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  13. The mass of a uniform circular ring of radius 0.2m is 0.1kg. Calcuate ...

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  14. Two bodies of mass 1 kg and 2 kg are attached to the ends of a 2 me...

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  15. If the radius of gyration of a solid disc of mass 10 kg about an axis ...

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  16. A hoop of mass 500gm & radius 10cm is placed on a nail, then the momen...

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  17. The ratio of moments of inertia of two solid spheres of same mass but ...

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  18. The radius of a solid sphere is R and its density D. When it is made t...

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  19. Three particles of masses 1gm, 2gm & 3gm are at 1cm, 2cm & 3cm from th...

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  20. The radius of gyration of body is 18cm when it is rotating about an ax...

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