Questions
A wheel is rotating freely with an angular speed on a shaft. The moment of inertia of the wheel is and the moment of inertia of the shaft is negligible. Another wheel of moment of inertia initially at rest is suddenly coupled to the same shaft. The resultant fractional loss in the kinetic energy of the system is:
detailed solution
Correct option is D
Conservation of Angular Momentum, ⇒Iω+3I(0)=Iω1+3Iω1 ⇒ω4=ω1⇒Loss in Kinetic energy=Ki-Kf= 12Iω2−124Iω42=38Iω2⇒Fractional loss=Ki-KfKi=38Iω212Iω2=34Similar Questions
A boy stands over the centre of a horizontal platform which is rotating freely with a speed of 2 revolutions/s about a vertical axis through the centre of the platform and straight up through the boy. He holds 2 kg masses in each of his hands close to his body. The. combined moment of inertia of the system is 1 kgmetre2. The boy now stretches his arms so as to hold the masses far from his body. In this situation, the moment of inertia of the system increases to 2kgmetre2. The kinetic energy of the system in the latter case as compared with that in the previous case will
Get your all doubts cleared from
Sri Chaitanya experts
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests