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A flywheel rotates with uniform angular acceleration. Its angular velocity increases from $20 π r a d s^{- 1}$ to $40 π r a d s^{- 1}$ in $10 s$ . How many rotations did it make in this period?

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Important Questions on Systems of Particles and Rotational Motion

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Agniveer Vayu

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 7 - Systems of Particles and Rotational Motion>Exercise>Q 3

A disc is rotating with an angular velocity

ω_{0}

. A constant retarding torque is applied on it to stop the disc. The angular velocity becomes

(ω_{0} / 2)

after

n

rotations. How many more rotations will it make before coming to rest?

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 7 - Systems of Particles and Rotational Motion>Exercise>Q 4

A constant couple of

400 N m

turns a wheel of moment of inertia

100 kg m^{2}

about an axis through its centre. The angular velocity gained in

4 s

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 7 - Systems of Particles and Rotational Motion>Exercise>Q 5

If the length of the second's hand in a stop-clock is

3 cm

, the angular velocity and linear velocity of the tip is

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 7 - Systems of Particles and Rotational Motion>Exercise>Q 6

The wheels on the old-time bicycle shown in the diagram have radii of

60.0 cm

. and

10.0 cm

. If the larger wheel is rotating at

12.0 rad s^{- 1}

, what is the angular speed of the smaller wheel?

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 7 - Systems of Particles and Rotational Motion>Exercise>Q 1

Which of the following increases the moment of force on an object?

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 7 - Systems of Particles and Rotational Motion>Exercise>Q 2

The force

7 \hat{i} + 3 \hat{j} - 5 \hat{k}

acts on a particle whose position vector is

\hat{i} - \hat{j} + \hat{k}

. What is the torque of a given force about the origin?

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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 7 - Systems of Particles and Rotational Motion>Exercise>Q 3

A rigid rod of length

2 L

is acted upon by some forces. All forces labelled

F

have the same magnitude. Which cases have a non-zero net torque acting on the rod about its center?
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Achieve Indian Airforce Agniveer Vayu Physics Practice Book>Chapter 7 - Systems of Particles and Rotational Motion>Exercise>Q 4

A metre stick is balanced on a knife edge at its centre. When two coins, each of mass

5 g

are put one on top of the other at the

12

cm

mark, the stick is found to be balanced at

45

cm

. The mass of the meter stick is:

A flywheel rotates with uniform angular acceleration. Its angular velocity increases from 20π rads-1 to 40 π rads-1 in 10 s. How many rotations did it make in this period?

Important Questions on Systems of Particles and Rotational Motion

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A flywheel rotates with uniform angular acceleration. Its angular velocity increases from $20 π r a d s^{- 1}$ to $40 π r a d s^{- 1}$ in $10 s$ . How many rotations did it make in this period?