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Find the moment of inertia of a uniform annular disc of mass $100 g$ , having an inner radius $10 cm$ and outer radius $20 cm$ , about an axis passing through its centre and perpendicular to its plane.

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Important Questions on Rotational Mechanics

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 38

Three objects,

A

: (a solid sphere),

B

: (a thin circular disk) and

C =

(a circular ring), each have the same mass

M

and radius

R

. They all spin with the same angular speed or about their own symmetry axes. The amounts of work

(W)

required to bring them to rest would satisfy the relation:

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 39

The moment of force,

\vec{F} = 4 \hat{i} + 5 \hat{j} - 6 \hat{k}

(2, 0, - 3)

about the point,

(2, - 2, - 2)

is given by,

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 40

A solid sphere is in a rolling motion. In rolling motion, a body possesses translational kinetic energy

(K_{t})

as well as rotational kinetic energy

(K_{r})

simultaneously, The ratio

K_{t} : (K_{t} + K_{r})

for the sphere is

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 41

A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Analytical Questions)>Q 1

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The tractor is moving with a velocity of $6 km h^{- 1}$ . Mass of belt is $720 gm$ . $K E$ of the belt is:-

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Analytical Questions)>Q 2

An elevator initially at rest supported by a cable passes over a pulley of radius

0.4 m

. It is accelerated upwards with

0.6 m s^{- 2} .

Find the number of rotations made by pulley during

10 s

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Analytical Questions)>Q 3

A string is wound round the rim of a mounted flywheel disc of mass

20 kg

and radius

20 cm

. A steady pull of

25 N

is applied to the cord. Neglecting friction and mass of the string, the angular acceleration of the wheel is:-

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Analytical Questions)>Q 4

The figure shows a horizontal block of mass $M$ suspended by two wires $A$ and $B$ . The centre of mass of the block is closer to $B$ than $A$ . $(i)$ Is the magnitude of the torque due to wire $A$ is greater, less or equal to that due to $B$ w.r.t. centre of mass? $(ii)$ Which wire $A$ or $B$ exerts more force on the block?

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Find the moment of inertia of a uniform annular disc of mass 100 g, having an inner radius 10 cm and outer radius 20 cm, about an axis passing through its centre and perpendicular to its plane.

Important Questions on Rotational Mechanics

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Find the moment of inertia of a uniform annular disc of mass $100 g$ , having an inner radius $10 cm$ and outer radius $20 cm$ , about an axis passing through its centre and perpendicular to its plane.