Earth And Other Planets!

According to cosmozoic theory, life coines on earth from other planets in space in the form of

The diameter and density of a planet are twice that of the earth. Assuming the earth and the planet to be of uniform density, find the ratio of the lengths of two simple pendulums, of equal time periods, on the surface of the planet and the earth.

The mass of a planet is twice the mass of earth and diameter of the planet is thrie the diameter of the earth, then the acceleration due to gravity on the planet's surface is

If the density of the planet is double that of the earth and the radius 1.5 times that of the earth, the acceleration due to gravity on the planet is

Weight on other planets- Space itself has no gravity but stars, moons and other planets do. In fact, they have either more or less gravity than Earth, depending on their mass. This means that your weight will be more or less on other planets than what your weight is on Earth. The gravity on moon is 1/6th of the Earth's gravity so your weight on moon will be 1/6th of your weight on Earth. If your weight is 48 kg on Earth, figure out how much you would weigh on each of the following planets? (1) Mars " " (2) Jupiter " " (3) Saturn

Planet A is at a distance of 9.35xx10^(6)km from Earth and planet B is 6.27xx10^(7) km from Earth. Which planet is nearer to Earth?