If the mass of the Sun, Earth and the distance between them are M, m and r respectively; The work done by the gravity of the Sun for a revolution around the Sun of the Earth.
A. zero
B. $$\frac{{GMm}}{{{r^2}}}$$
C. $$\frac{{GM.m}}{r}.2\pi $$
D. $$\frac{{GMm}}{{{r^2}}}.2\pi $$
Answer: Option A
This Question Belongs to Physics GK Chapter Wise >> Gravitational Force
The movement of the Moon around the Earth is due to . . . . . . . .
A. Gravitational force
B. Centrifugal force
C. Concentric force
D. Nuclear force
Which one of the following statements about a satellite orbiting around the earth is correct?
A. Satellite is kept in orbit by remote control from ground station
B. Satellite is kept in orbit by retro-rocket and solar energy keeps it moving around the earth
C. Satellite requires energy from solar panels and solid fuels for orbiting
D. Satellite does not required any energy for orbiting
What will happen if an object is thrown into space with the speed of 8 km/s?
A. The object will go into space
B. It will return to Earth
C. It will rotate into the orbit of Earth
D. It will burst out
Astronauts feel . . . . . . . . weight inside the spacecraft.
A. more
B. less
C. zero
D. depends on G force
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