Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 58

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A disc of radius $2 m$ and mass $200 kg$ is acted upon by a torque $100 N m .$ Its angular acceleration would be

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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 59

Rotational power in rotational motion is

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 60

A constant torque of

31.4 N - m

is exerted on a pivoted wheel. If the angular acceleration of the wheel is

4 π r a d / s^{2}

, then the moment of inertia of the wheel is

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 61

A body whose moment of inertia is

3 kg m^{2}

is at rest. It is rotated for

20 s

by a torque of

6 N m

, angular displacement of the body will be

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 62

A force

\vec{F} = 4 \hat{i} - 10 \hat{j}

acts on a body at a point having a position vector

- 5 \hat{i} - 3 \hat{j}

relative to the origin of coordinates on the axis of rotation. The torque acting on the body about the origin is:

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 63

A force

\vec{F} = 2 \hat{i} + 3 \hat{j} - \hat{k}

acts at a point

(2, - 3, 1)

. Then the magnitude of the torque about the point

(0, 0, 2)

will be

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 64

In case of torque of a couple if the axis is changed by displacing it parallel to itself, torque will

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 65

A torque of

30 N m

is acting on a wheel of mass

5 kg

and moment of inertia

2 kg m^{2}

. If the wheel starts rotating from rest then its angular displacement in

10

seconds will be-

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Alpha Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise-1>Q 66

Let $\vec{F}$ be the force acting on a particle having position vector $\vec{r}$ and $\vec{τ}$ be the torque of this force about the origin. Then