MHT CET 2021 21th September Evening Shift | Rotational Motion Question 78 | Physics

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)

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MHT CET 2021 21th September Evening Shift Physics - Rotational Motion Question 95 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$$^2$$

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

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The moment of inertia of a circular disc of radius $$2 \mathrm{~m}$$ and mass $$1 \mathrm{~kg}$$ about an axis XY passing through its centre of mass and perpendicular to the plane of the disc is $$2 \mathrm{~kg} \mathrm{~m}^2$$. The moment of inertia about an axis parallel to the axis $$\mathrm{XY}$$ and passing through the edge of the disc is

$$6 \mathrm{~kg} \mathrm{~m}^2$$

$$4 \mathrm{~kg} \mathrm{~m}^2$$

$$10 \mathrm{~kg} \mathrm{~m}^2$$

$$8 \mathrm{~kg} \mathrm{~m}^2$$

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

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The moment of inertia of a body about a given axis is $$1.2 \mathrm{~kg} / \mathrm{m}^3$$. Initially the body is at rest. In order to produce rotational kinetic energy of $$1500 \mathrm{~J}$$, an angular acceleration of $$25 \mathrm{rad} / \mathrm{s}^2$$ must be applied about an axis for a time duration of

8 s

2 s

4 s

1 s

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