Student Login

Home›Chapters›Rotational Motion PYQs›Rotational Kinetic Energy, Work & Power›Question 27

MHT CET 2023 (13 May, Shift 1) · Rotational Kinetic Energy, Work & Power

Rotational Kinetic Energy, Work & Power question from MHT CET 2023 (13 May, Shift 1)

Q27MHT CET 2023 · 13 MAY · SHIFT 1Easy

Rotational Kinetic Energy, Work & Power

A rigid body rotates with an angular momentum L. If its rotational kinetic energy is made four times, its angular momentum will become

Show answer and solution

Answer: (d)

$L = \sqrt{2IK}$ , so $L \propto \sqrt{K}$ for the same $I$ .
$K' = 4K \Rightarrow L' = \sqrt{4}\,L = 2L$
So the answer is (d) 2 L.

Report a mistake

More questions on Rotational Kinetic Energy, Work & Power

Two bodies have their moments of inertia I and 2I respectively about their axis of…MHT CET 2023 (11 May, Shift 2)
A solid sphere of mass 500 g and radius 5 cm is rotated about one of its diameters with…JEE Main 2023 (11 Apr, Shift 1)
A thin uniform rod of mass ' m ' and length ' l ' is suspended from one end which can…MHT CET 2023 (14 May, Shift 1)
A thin uniform rod AB of mass m and length l is hinged at one end A to the ground level…MHT CET 2023 (13 May, Shift 2)
An energy of 484 J is spent in increasing the speed of a flywheel from 60 rpm to 360 rpm…NEET 2022 (Phase 2)
The moment of inertia of a body about the given axis, rotating with angular velocity 1…MHT CET 2021 (23 Sep, Shift 2)
A molecule consists of two atoms each of mass ' m ' and separated by a distance ' d '. At…MHT CET 2021 (23 Sep, Shift 1)
Two rotating bodies P and Q of masses ' m ' and ' 2m ' with moment of inertia IP and IQ…MHT CET 2021 (22 Sep, Shift 1)