1.

The gravitational field strength at the surface of a certain planet is g. Which of the following is the gravitational field strength at the surface of a planet with twice the mass?

Answer»

`g//2`
g
2g
4g.

Solution :`E=(GM)/(R^(2))=g(R^(2))/(R^(2))=g`
`(E.)/(E )=(g.)/(g)=(M^(1))/(M)xx(R^(2))/(R^(2,))=(2M)/(M)=(R^(2))/(4R^(2))=(1)/(2)`
`therefore E.=(E )/(2)=(g)/(2)`.
So CORRECT choice is (a).


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