Mars in a Minute: How Long is a Year on Mars?

The mean diameters of Mars and Earth are 6.9 xx 10^3 km and 1.3 xx 10^4 km, respectively. The mass of Mars is 0.11 times Earth's mass. (a) What is the ratio of the mean density (mass per unit volume) of Mars to that of Earth? (b) What is the value of the gravitational acceleration on Mars? (c) What is the escape speed on Mars?

Talking the mass and radius of the earth as the units of mass and distance respectively, the mass of Mars turns out to be 0.107 unit and radius 0.53 units. What is the acceleration due to gravity on the Mar's surface? What will be the weight of a person on Mars if he weighs 98kg on earth.

Why is life not possible on Venus and Mars?

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

The planet Mars has two moons. Phobos and Delmos (i) phobos has period 7 hours, 39 minutes and an orbital radius of 9.4 xx 10^(3) km . Calculate the mass of Mars. (ii) Assume that Earth and mars move in a circular orbit around the sun, with the martian orbit being 1.52 times the orbital radius of the Earth. What is the length of the martian year in days? (G = 6.67 xx 10^(-11) Nm^(2) kg^(-2))

Phobo is a satellite of Mars. The period of its revolution around Mars is 0.319 days and its mean distance from Mars is 9.519xx10^(6)m . Assuming that the mass of Phobos is negligible compared to that of Mars, calculate the mass of Mars. Take G=6.668xx10^(-11)Nm^(-2)kg^(-2)

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:

The acceleration due to gravity on the surface of the earth is 10 ms^(-2) . The mass of the planet . Mars as compared to earth is 1/10 and radius is 1/2 . Determine the gravitational acceleration of a body on the surface on Mars .