Question

3. The S.l and C.G. Units of weight
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4. Write the expression for escape velocity of an object
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5. Write the value of g at the centre of the earth
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Answer 1

Answer:  3. The S.I. unit of weight is 'kg' whereas the C.G. unit of weight is 'centigram'.  4. The gravitational potential energy of a body of mass 'm' on the surface of the earth is,                                                           Ep1=GMm/R                       ...1 When the body escapes earth's attraction, it's potential energy becomes,                                                          Ep2=0                                ...2 From energy conservation,                       Ep1-Ep2=1/2mVe^2    GMm/R=1/2mVe^2    Ve=route2gR  5. 9.8m/s

Answer 2

5 In the first equation above, g is referred to as the acceleration of gravity. Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2. When discussing the acceleration of gravity, it was mentioned that the value of g is dependent upon location.