Question

Two spherical stars each of mass M with their centres distant D apart revolve under mutual gravitational attraction about the point midway between their centres. The period of revolution will be –

• A. p
• B. 2p$\sqrt { \frac { \mathrm { D } ^ { 3 } } { 2 \mathrm { GM } } }$
• C. 2p
• D. p

Answer 1

Answer: (B)

2p$\sqrt { \frac { \mathrm { D } ^ { 3 } } { 2 \mathrm { GM } } }$

Answer 2

If the velocity is v₀ so

= Ž v₀ =

so T =$\sqrt { \frac { \mathrm { D } ^ { 3 } } { 2 \mathrm { GM } } }$