The height a which the weight of a body becomes 1/16th its weight on the surface of earth (radius R) is
A rocket is fired from the earth towards the sun. At what distance from the earths centre is the gravitational force on the rocket zero? Mass of the sun = 2× 1030kg, mass of the earth = 6× 1024kg. Neglect the effect of other planets etc. (orbital radius = 1.5× 1011m).
The satellite of mass m revolving in a circular orbit of radius r around the earth has kinetic energy E. then, its angular momentum will be
Assertion :A block of wood is floating in a pond of water and its apparent weigth is zero.
Reason :The weight of water displaced (buoyant force) acting vertically upwards is just equal to the weight of the body which acts vertically downwards.
The escape velocity of a sphere of mass m is given by (G= univesal gravitational constant, Me= mass of the earth and Re= radius of the earth)