Question

The escape velocity of an object on a planet whose radius is 4 times that of the earth and $$g$$ value 9 times that on the earth, in kms$$^{-1}$$ is

A
33.6
B
67.2
C
16.8
D
25.2

Solution

The correct option is B 67.2Escape speed is given by, $$v_{min}=\sqrt {2gR}$$which is equal to $$\approx11.2$$ km/s on Earth's surface.For another planet with radius 4 times and $$g$$ value 9 times that of Earth$$v^{'}_{min}=\sqrt {2\times9g\times4R}$$        $$=6 \times \sqrt {2gR}=6\times11.2$$        $$=67.2$$ $$km/s$$Physics

Suggest Corrections

0

Similar questions
View More

People also searched for
View More