A spacecraft consumes more fuel in going the earth the moon than it takes for a return trip. Comment on this statement.

When an spacecraft goes from earth to moon along a straight path, what changes occurs in weight?

A LASER is a source of very intense, monochromatic, and unidirectional beam of light.These properties of a laser light can be exploited to measure long distance. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light . A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon's surface. How much is the radius of the lunar orbit around the Earth ?

A rocket is fired vertically with a speed of 5 km s^(-1) from the earth’s surface. How far from the earth does the rocket go before returning to the earth ? Mass of the earth = 6.0 × 10^(24) kg, mean radius of the earth = 6.4 xx 10^(6) m , G = 6.67 xx 10^(-11) " N "m^(2) kg^(-2) .

Statement-1: Two satellites A & B are in the same orbit around the earth B being behind A. B cannot overtake A by increasing its speed. Statement-2: it will then go into a different orbit.