MCQ
A solid hemisphere of weight $P$ rests with its curved surface in contact with a rough inclined plane. A weight $Q$ is placed at some point on the rim of the hemisphere to keep its plane surface horizontal then its minimum coefficient of friction is
- ✓$\mu = \,\frac{Q}{{\sqrt {P(P + 2Q)} }}$
- B$\mu = \,\frac{Q}{{\sqrt {P(Q + 2P)} }}$
- C$\mu = \,\frac{P+Q}{{\sqrt {P(P + 2Q)} }}$
- D$\mu = \,\frac{P-Q}{{\sqrt {P(P + 2Q)} }}$
