Newton’s Law

Objects in the Solar system: (i) Asteroids Asteroids are small heavenly bodies which orbit round the Sun between the orbits of Mars and Jupiter. They…

The ratio of the amount of solar energy reflected by the planet to that incident on it is known as albedo. From the knowledge of…

In the universe one heavenly body revolves around another massive heavenly body (The Earth revolves around the Sun and the moon revolves around the Earth).…

The planets do not emit light of their own. They reflect the Sun’s light that falls on them. Only a fraction of the solar radiation…

The ancient astronomers contributed a great deal by identifying the planets in the solar system and carefully plotting the variations in their positions of the…

The part of the universe in which the Sun occupies the central position of the system holding together all the heavenly bodies such as planets,…

To place a satellite at a height of 300 km, the launching velocity should at least be about 8.5 km s-1 or 30600 kmph If…

A rocket is a vehicle which propels itself by ejecting a part of its mass. Rockets are used to carry the payloads (satellites). We have…

The polar satellites revolve around the Earth in a north-south orbit passing over the poles as the Earth spins about its north-south axis. It is a…

Television pictures and photographs show astronauts and objects floating in satellites orbiting the Earth. This apparent weightlessness is sometimes explained wrongly as zero-gravity condition. Consider…