Angular Momentum and its Conservation for a Rigid Body
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PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365680 If the earth suddenly changes its radius \(x\) times the present value, the new period of rotation would be

1 \(6 x^{2} h\)
2 \(24 x^{2} h\)
3 \(12 x^{2} h\)
4 \(48 x^{2} h\)
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365681 Assertion :
If earth shrinks to half its present size, length of the day would become 6 hours.
Reason :
As size of the earth changes its moment of inertia changes.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365682 If polar ice caps melt, then the time duration of the day

1 Increases
2 Decreases
3 Does not change
4 Zero
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365683 A disc is freely rotating with an angular speed \(\omega\) on a smooth horizontal plane. If it is hooked at a rigid point \(\mathrm{P}\) and rotates without bouncing about a point on its circumference. Its angular speed after the impact will be equal to
supporting img

1 \(\dfrac{\omega}{3}\)
2 \(\dfrac{\omega}{2}\)
3 \(\dfrac{2 \omega}{3}\)
4 None of these
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PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365680 If the earth suddenly changes its radius \(x\) times the present value, the new period of rotation would be

1 \(6 x^{2} h\)
2 \(24 x^{2} h\)
3 \(12 x^{2} h\)
4 \(48 x^{2} h\)
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365681 Assertion :
If earth shrinks to half its present size, length of the day would become 6 hours.
Reason :
As size of the earth changes its moment of inertia changes.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365682 If polar ice caps melt, then the time duration of the day

1 Increases
2 Decreases
3 Does not change
4 Zero
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365683 A disc is freely rotating with an angular speed \(\omega\) on a smooth horizontal plane. If it is hooked at a rigid point \(\mathrm{P}\) and rotates without bouncing about a point on its circumference. Its angular speed after the impact will be equal to
supporting img

1 \(\dfrac{\omega}{3}\)
2 \(\dfrac{\omega}{2}\)
3 \(\dfrac{2 \omega}{3}\)
4 None of these
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PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365680 If the earth suddenly changes its radius \(x\) times the present value, the new period of rotation would be

1 \(6 x^{2} h\)
2 \(24 x^{2} h\)
3 \(12 x^{2} h\)
4 \(48 x^{2} h\)
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365681 Assertion :
If earth shrinks to half its present size, length of the day would become 6 hours.
Reason :
As size of the earth changes its moment of inertia changes.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365682 If polar ice caps melt, then the time duration of the day

1 Increases
2 Decreases
3 Does not change
4 Zero
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365683 A disc is freely rotating with an angular speed \(\omega\) on a smooth horizontal plane. If it is hooked at a rigid point \(\mathrm{P}\) and rotates without bouncing about a point on its circumference. Its angular speed after the impact will be equal to
supporting img

1 \(\dfrac{\omega}{3}\)
2 \(\dfrac{\omega}{2}\)
3 \(\dfrac{2 \omega}{3}\)
4 None of these
NEET DIGITAL LIBRARY
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365680 If the earth suddenly changes its radius \(x\) times the present value, the new period of rotation would be

1 \(6 x^{2} h\)
2 \(24 x^{2} h\)
3 \(12 x^{2} h\)
4 \(48 x^{2} h\)
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365681 Assertion :
If earth shrinks to half its present size, length of the day would become 6 hours.
Reason :
As size of the earth changes its moment of inertia changes.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365682 If polar ice caps melt, then the time duration of the day

1 Increases
2 Decreases
3 Does not change
4 Zero
PHXI07:SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

365683 A disc is freely rotating with an angular speed \(\omega\) on a smooth horizontal plane. If it is hooked at a rigid point \(\mathrm{P}\) and rotates without bouncing about a point on its circumference. Its angular speed after the impact will be equal to
supporting img

1 \(\dfrac{\omega}{3}\)
2 \(\dfrac{\omega}{2}\)
3 \(\dfrac{2 \omega}{3}\)
4 None of these
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