If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth, is
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Suppose the earth increases its speed of rotation . At what new time period will the weightof a body on the equator becomes zero? Take g=10s2m and radius of the earth R=6400km.
A black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass =5.98×1024kg) have to be compresed to be a black hole?
A satellite of mass m is orbiting the earth (of radius R) at a height h from its surface. The total energy of the satellite in terms of g0, the value of acceleration due to gravity at the earth's surface,
Two stars each of one solar mass (=2×1030 kg) are approaching each other for a head on collision. When they are a distance 109 km, their speeds are negligible. What is the speed with which they collide ? The radius of each star is 104 km. Assume the stars to remain undistorted until they collide. (Use the known value of G).
The earth is assumed to be a sphere of raduis R. A plateform is arranged at a height R from the surface of the fve, where ve is its escape velocity form the surface of the earth. The value of f is
Buoyant force on an object immersed in a liquid acts in upward direction.
Why does a black of wood held under water rise to the surface when released?