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The angular velocity of a body is vec (...

The angular velocity of a body is ` vec (omega)- = 2 hat(i) + 3 hat(j) + 4 hat (k)` and torque `hat(tau) = hat(i) + 2 hat(j) + 3 hat(k)` acts on it. The rotational power will be

A

20 watt

B

15 watt

C

`sqrt(17)` watt

D

`sqrt(14)` watt

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The correct Answer is:
A
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MOTION-ROTATIONAL MOTION -Exercise - 1
  1. Equivalent to force in rotational motion is

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  2. Torque/moment of inertia equals to

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  3. The angular velocity of a body is vec (omega)- = 2 hat(i) + 3 hat(j) ...

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  4. A force of (2 hati - 4 hatj + 2 hatk )N act a point (3 hati+2 hatj -4 ...

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  5. A wheel has moment of inertia 5 xx 10^(-3) kg m^(2) and is making 20 "...

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  6. The moment of inertia of a body about a given axis of rotation depends...

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  7. Two rotating bodies have same angular momentum but their moments of in...

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  8. the flywheel is so constructed that the entire mass of it is concentra...

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  9. A stone attached to one end of string is revolved around a stick so th...

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  10. The graph between the angular momentum J and angular velocity omega w...

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  11. Which of the following pairs do not correctly matched ?

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  12. A rotating table completes one rotation is 10 sec. and its moment of i...

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  13. All the particles of a rigid rotating body move in a circular path whe...

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  14. On meltng of ice on the pole of the earth, its moment of inertia will ...

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  15. The wheels of moving vehicles are made hollow in the middle and thick ...

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  16. By the theorem of perpendicular axes, if a body be in X-Z-plane then :...

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  17. The theorem of perpendicular axes is not applicable for determination ...

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  18. A solid sphere and hollow sphere of the same material have mass. Then ...

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  19. Three spheres, each mass M and radius R, are arranged as shown in the ...

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  20. If the earth loses its atmosphere sudenly, then the duration of day wi...

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