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An automobile moves on a road with a speed of $54 k m h^{- 1}$ The moment of inertia about its axis of rotation is $3 k g m^{2}$ . If the vehicle is brought to rest in $15 s$ , the magnitude of average torque transmitted by its brakes to the wheel is

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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 27

What will be the value of the maximum acceleration of the truck in the forward direction so that the block kept on, the back does not topple?
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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 28

From a disc of radius

R

and mass

M

, a circular hole of diameter

R

, whose rim passes through the centre of the disc is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis passing through the centre of the disc?

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 31

Two rotating bodies

A

and

B

of masses

m

and

2 m

with moments of inertia

I_{A}

and

I_{B} (I_{B} > I_{A})

have equal kinetic energy of rotation. If

L_{A}

and

L_{B}

be their angular momenta respectively, then

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 33

A light rod of length

l

has two masses

m_{1}

and

m_{2}

attached to its two ends. The moment of inertia of the system about an axis perpendicular to the rod and passing through the centre of mass is

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 35

A rope is wound around a hollow cylinder of mass

3 kg

and radius

40 cm .

What is the angular acceleration of the cylinder if the rope is pulled with a force of

30 N ?

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 36

Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities

ω_{1}

and

ω_{2}

. They are brought in to contact face to face coinciding the axis of rotation. The expression for the loss of energy during this process is:

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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 37

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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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,

An automobile moves on a road with a speed of 54kmh-1 The moment of inertia about its axis of rotation is 3kgm2. If the vehicle is brought to rest in 15s, the magnitude of average torque transmitted by its brakes to the wheel is

Important Questions on Rotational Mechanics

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An automobile moves on a road with a speed of $54 k m h^{- 1}$ The moment of inertia about its axis of rotation is $3 k g m^{2}$ . If the vehicle is brought to rest in $15 s$ , the magnitude of average torque transmitted by its brakes to the wheel is