Question

The mass and diameter of a planet have twice the value of the corresponding parameters of earth. Acceleration due to gravity on the surface of the planet is

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

Answer 2

$\frac { g ^ { \prime } } { g } = \frac { M ^ { \prime } } { M } \left( \frac { R } { R ^ { \prime } } \right) ^ { 2 } = \left( \frac { 2 M } { M } \right) \left( \frac { R } { 2 R } \right) ^ { 2 } = \frac { 1 } { 2 }$

⇒$g ^ { \prime } = \frac { g } { 2 } = \frac { 9.8 } { 2 } = 4.9 \mathrm {~m} / \mathrm { s } ^ { 2 }$