Question

Initial angular velocity of a circular disc of mass $M$ is ${\omega }_1$. Then two small spheres of mass $m$ are attached gently to two diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc?

• A. $\left(\frac{M+m}{M}\right){\omega }_1$
• B. $\left(\frac{M+m}{m}\right){\omega }_1$
• C. $\left(\frac{M}{M+4m}\right){\omega }_1$
• D. $\left(\frac{M}{M+2m}\right){\omega }_1$

Answer 1

The correct option is C $\left(\frac{M}{M+4m}\right){\omega }_1$