Q16 of 27 Page 66

What is the source of centripetal force that a planet requires to revolve around the Sun? On what factors does that force depend?

The gravitational pull of sun provides necessary centripetal acceleration to the planet to revolve around it. This force depends on the product of the masses of the planet and sun and the distance between them.


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A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the brick will be

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An apple falls from a tree because of gravitational attraction between the earth and apple. If F1 is the magnitude of force exerted by the earth on the apple and F2 is the magnitude of force exerted by apple on earth, then

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On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?

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Suppose gravity of earth suddenly becomes zero, then in which direction will the moon begin to move if no other celestial body affects it?