State the Archimedes principle.
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Why will a sheet of paper fall slower than one that is crumpled into a ball?
Gravitational force on the surface of the moon is only 61 as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the earth?
A seconds pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket
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
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)
A geostationary satellite is orbiting the earth at a height of 5R above the surface of the earth, 2R being the radius of the earth. The time period of another satellite in hours at a height of 2R form the surface of the earth is
Six particles each of mass 'm' are placed at six verties A,B,C,D,Eand F of a regular hexagon of side 'a'. A seventh particle of mass 'M' is kept at center 'O' of the hexagon. (a)Find net force on 'M'. (b)Find net force on 'M' if particles at A is removed. (c) Find net force on 'M' if particles at A and C are removed .
What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6×1024 kg and radius of the earth is 6.4×106 m.)