Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 87

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A rod can rotate about a fixed vertical axis, passing through one of its end. The mass is non-uniformly distributed along the length of the rod. A horizontal force of constant magnitude and always perpendicular to the rod is applied at the end. Which of the following quantity (after one rotation) will not depend on the information that through which end the axis passes? (Assuming initial angular velocity to be zero)

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Important Questions on Rotational Mechanics

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 88

A platform is revolving in a horizontal plane about a fixed axis and a boy is sitting at the center. The initial kinetic energy of the system is

K .

If the boy stretches his arms then a moment of inertia of the system becomes double. The final kinetic energy of the system is:

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 89

On account of melting of ice at the north pole, the moment of inertia of spinning earth,

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 90

Two rigid bodies

A

and

B

rotate with rotational kinetic energies

E_{A}

and

E_{B}

respectively. The moments of inertia of

A

and

B

about the axis of rotation are

I_{A}

and

I_{B}

respectively. If

I_{A} = \frac{I_{B}}{4}

and

E_{A} = 100 E_{B}

the ratio of angular momentum

(L_{A})

of

A

to the angular momentum

(L_{B})

of

B

is

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 91

The moments of inertia of two rotating bodies $A$ and $B$ are $I_{A}$ and $I_{B} (I_{A} > I_{B})$ and their angular momentum are equal. If their kinetic energies be $K_{A}$ and $K_{d},$ respectively, then

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 92

When a body rotates about an axis the quantity which remains the same for all its particles is

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 93

The rate of change of angular momentum is called

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 94

The torque applied to a ring revolving about its own axis so as to change its angular momentum by

2 J - s .

in

5 s,

is

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 95

When a mass is rotating in a plane about a fixed point, its angular momentum is directed along