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Why is there no atmosphere on the surfac...

Why is there no atmosphere on the surface of the moon ?

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Between the earth and the moon, which one has a greater escape velocity ? Give reason. or, Is the value of the escape velocity from the earth's surface the same as that from the surface of the moon ?

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The ratio of the mass of the moon to that of the earth is 1:81. If the radius of the moon is assumed to be one-fourth of that of the earth , then what is the acceleration due to gravity on the surface of the moon in terms of that on the earth's surface ? Hence, find the escape velocity from the surface of the moon in terms of that from the earth's surface.

What will be the effective length of a seconds pendulum on the surface of the moon? The mass and the diameter of the earth are 80 times and 4 times the mass and the diameter respectively of the moon.

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Due to cosmic shower same amount of cations +q are stored in the atmosphere of the earth and the moon. If the gravitational attraction between the earth and the moon is exactly equal to the electric repulsion between them. Then find the value of charge q stored in their atmosphere.

At what height above the surface of the earth is the gravitational potential energy of a body equal to that on the surface of the moon ? Assume that the mass of the earth is 80 times that of the moon and the radius of the earth is 4 times that of the moon. Given ,Radius of the earth =6400 km.

Determine the value of the escape velocity from the surface of the moon. The radius of the moon= 1.7xx10^6m and its mass = 7.35xx10^(22)kg. (G=6.67xx10^(-11)N*m^2*kg^(-2))