Question

Assertion (A): Two satellites A and B are in the same orbit around the earth, such that A Leads B. Satellite B can overtake satellite A by increasing its speed. Reason (R): Orbital speeds of two satellites in same orbit may different

Assertion (A): Period of revolution of satellite in circular orbit around earth is inversely proportional to cube of its orbital speed. Reason (R): Period of revolution in uniform circular motion is given by T = 2πr/v, where r is radius of orbit and v is speed.

Assertion (A): Moon revolving around earth does not come closer despite earth's gravitational attraction. Reason (R): A radially outward force balances earth's force of attraction during revolution of moon.

In a two stage launch of a satellite, the first stage brings the satellite to a height of 150 km and the 2nd stage gives it the necessary critical speed to put it in a circular orbit. Which stage requires more expenditure of fuel? Given mass of earth = 6.0 × 10²⁴ kg, radius of earth = 400 km.