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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 25

Point masses $m_{1}$ and $m_{2}$ are placed at the opposite ends of a rigid rod of length $L$ , and negligible mass. The rod is to be set rotating about an axis perpendicular to it. The position of point $P$ on this rod through which the axis should pass so that the work required to set the rod rotating with angular velocity $ω_{0}$ is minimum, is given by:-
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Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Previous Year Questions)>Q 26

The radius of a rotating sphere decreases by

2 %

keeping the mass constant, the change in its rotational kinetic energy ?

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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 30

A disc and a sphere of the same radius but different masses roll off on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first?

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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 32

A solid sphere of mass

m

And radius

R

Is rotating about its diameter. A solid cylinder of the same mass and same radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their kinetic energies of rotation

(\frac{E_{sphere}}{E_{cylinder}})

Will be

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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

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