A spacecraft consumes more fuel in going from earth to moon than it does on the return trip. Comment on this.

As a spacecraft moves from earth to moon, how does, its weight vary?

Why does the moon revolve round the earth?

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 distances. 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?

Does the escape speed of a body from the earth depend on the mass of the body,

Does the escape speed of a body from the earth depend on the height of the location from where the body is launched?

Does the escape speed of a body from the earth depend on the location from where it is projected,

Why does the earth have an atmosphere and the moon does not?

The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? Why?

A motor boat whose speed in still water 15km/hr takes half an hour more to go 18km up stream than to returns dowm stream to the same spot.Find Speed of the stream.

How does the atomic radius change as you go from left to right in a period?