MHT CET 2021 22th September Evening Shift | Rotational Motion Question 30 | Physics

A child is standing with folded hands at the centre of the platform rotating about its central axis. The kinetic energy of the system is '$$K$$'. The child now stretches his arms so that the moment of inertia of the system becomes double. The kinetic energy of the system now is

$$\frac{K}{2}$$

$$2 \mathrm{~K}$$

$$4 \mathrm{~K}$$

$$\frac{\mathrm{K}}{4}$$

MHT CET 2021 22th September Evening Shift

MCQ (Single Correct Answer)

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Two rings of radius 'R' and 'nR' made of same material have the ratio of moment of inertia about an axis passing through its centre and perpendicular to the plane is $$1: 8$$. The value of '$$n$$' is (mass per unit length $$=\lambda$$)

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

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A particle performs rotational motion with an angular momentum 'L'. If frequency of rotation is doubled and its kinetic energy becomes one fourth, the angular momentum becomes.

$$\mathrm{\frac{L}{4}}$$

$$\mathrm{\frac{L}{8}}$$

$$\mathrm{\frac{L}{2}}$$

MHT CET 2021 21th September Evening Shift

MCQ (Single Correct Answer)

-0

MHT CET 2021 21th September Evening Shift Physics - Rotational Motion Question 34 English

Three rings each of mass 'M' and radius 'R' are arranged as shown in the figure. The moment of inertia of system about axis YY' will be

5 MR$$^2$$

$$\frac{7}{2}$$ MR$$^2$$

$$\frac{3}{2}$$ MR$$^2$$

3 MR$$^2$$

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