1
MHT CET 2021 21th September Evening Shift
+1
-0

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.

A
L
B
$$\mathrm{\frac{L}{4}}$$
C
$$\mathrm{\frac{L}{8}}$$
D
$$\mathrm{\frac{L}{2}}$$
2
MHT CET 2021 21th September Evening Shift
+1
-0

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

A
5 MR$$^2$$
B
$$\frac{7}{2}$$ MR$$^2$$
C
$$\frac{3}{2}$$ MR$$^2$$
D
3 MR$$^2$$
3
MHT CET 2021 21th September Morning Shift
+1
-0

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

A
$$6 \mathrm{~kg} \mathrm{~m}^2$$
B
$$4 \mathrm{~kg} \mathrm{~m}^2$$
C
$$10 \mathrm{~kg} \mathrm{~m}^2$$
D
$$8 \mathrm{~kg} \mathrm{~m}^2$$
4
MHT CET 2021 21th September Morning Shift
+1
-0

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

A
8 s
B
2 s
C
4 s
D
1 s
MHT CET Subjects
Physics
Mechanics
Optics
Electromagnetism
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Calculus
Coordinate Geometry
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