A child is standing with folded hands at the centre of platform rotating about its…
Physics · JEE Main · NTA Exams — Rotational Motion
A child is standing with folded hands at the centre of platform rotating about its central axis. The kinetic energy of the system is K. The child stretches his arms so that the moment of inertia of the system triples. The kinetic energy of the system now is
- K
- \(\frac{K}{3}\)
- \(\frac{K}{4}\)
- 4K
Answer
(C) K 4
Sign up free on Edukali to view the step-by-step worked solution and practice thousands of similar questions.
Related practice questions
- A string can bear a maximum tension of 100 Newton without breaking. A body of mass 1 kg is attached to one…
- Three-point masses, each of mass M, are placed at the corners of an equilateral triangle of side L. Then the…
- A disc of moment of inertia I1 is rotating freely with angular velocity ω1 when a second, non-rotating disc…
- A particle moves in a circle of a radius 30 cm. Its linear speed is given by : v = 2t, where t in second and…
- A body of mass m is moving in a circle of radius r with a constant speed v. The force on the body is mv 2 /r…
- A closed tube partly filled with water lies in a horizontal plane. If the tube is rotated about perpendicular…
- The moment of inertia of a solid sphere about an axis passing through centre of gravity is 2 5 M R^ 2 ; then…
- A chain of 125 links is 1.25 m long and has a mass of 2 kg with the ends fastened together it is set rotating…
More Rotational Motion questions · Browse all practice questions