Question

Two satellites A and B, the ratio of their masses being 3 : 1, are in the circular orbits of radii r and 4r. The ratio of total mechanical energy of A to that of B is –

• A. $\frac { 1 } { 3 }$
• B. 3
• C. $\frac { 3 } { 4 }$
• D. 12

Answer 1

Answer: (D)

12

Answer 2

E = – $\frac { \mathrm { GMm } } { 2 \mathrm { r } }$ or E µ $\frac { \mathrm { m } } { \mathrm { r } }$

\ = 12