Mars in a Minute: How Hard Is It to Land Curiosity on Mars?

The Earth has a circular orbit of radius r and period t around the sum, Mars has a circular orbit of radius R and period T. In order to send a spacecraft from the Earth to Mars, it is convenient to launch the spacecraft inot an elliptical orbit whose perihelion coincides with the orbit of the Earth and whose aphelion coincides with the orbit of Mars, this orbit requires the least amount of energy for a trip to Mars. The time t' taken by a spacecraft to reach Mars from the Earth satisfies:

Bauxite (Al_(2)O_(3).2H_(2)O) and Aluminosilicate both are ores of aluminium. Bauxite is found on earth but not on Mars whereas Aluminosilicate is found on earth as well as Mars. Possible reason is:

Mars is the nearest planet to the Earth.

In the echo method of estimating distnces, a radar signa was sent towards the Mars. If the echo was received after 8 minute 20 second, how far wat the Mars from the earth at that instant?

Assuming the mass of Earth to be ten times the mass of Mars, its radius to be twice the radius of Mars and the acceleration due to gravity on the surface of Earth is 10 m//s^(2) . Then the accelration due to gravity on the surface of Mars is given by

A body weight 45 kg wt on the surface of earth. Its weight on the surface of Mars will be [Mass of Mars = (1/9) mass of earth, Radius of Mars = (1/2) Radius of earth]

A body weighs 63 kg-wt on the surface of earth. Its weight on the surface of Mars will be (Mass of Mars = 1/9 mass of earth, Radius of 9 Mars = 1/2 Radius of earth)

A body weights 100 kg on earth . Find its weight on mars . The mass and radius of mars are 1/10 and 1/2 of the mass and radius of earth .