Question

A ring of mass $m$ and a particle of same mass are fixed on a disc of same mass such that centre of mass of the system lies at centre of the disc.The system rotate such that centre of mass of the disc move in a circle of radius $R$ with a constant angular velocity $\omega$. From this we conclude that

• A. An external force $m{\omega }^{2}R$ must be applied to central particle
• B. An extemal force $m{\omega }^{2}R$ must be applied to the ring
• C. An external force $3m{\omega }^{2}R$ must be applied to central particle
• D. An external force $3m{\omega }^{2}R$ must be applied anywhere on the system

Answer 1

The correct option is D An external force $3m{\omega }^{2}R$ must be applied anywhere on the system

When a ring of mass m and a particle of same mass are fixed on a disc of same mass such that centre of mass of the system lies at centre of the disc. The system rotate such that centre of mass of the disc move in a circle q of radius R with a constant angular velocity then An external force $3m{\omega }^{2}R$ must be applied anywhere on the system.