Q4 of 81 Page 223

Can you think of two particles which do not exert gravitational force on each other?

There are no particles which do not interact gravitationally. The massless particles like photons, have relativistic mass and hence experience to some degree, a gravitational force.


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2

Is there any meaning of “Weight of the earth”?

 3

If heavier bodies are attracted more strongly by the earth, why don’t they fall faster that the lighter bodies?

 5

The earth resolves round the sun because the sun attract the earth. The sun also attracts the moon and this force is about twice as large as the attraction of the earth on the moon. Why does the moon not resolve round the sun? Or does it?

 6

At noon, the sun and earth pull the objects on the earth’s surface in opposite directions. At midnight, the sun and the earth’s pull these objects in same direction. Is the weight of an objects, as measured by a spring balance on the earth’s surface, more at midnight as compared to its weight at noon?