1.

If the mass of a planet is 10% less than that of the earth and the radius 20% greater than that of earth, the accelerationdue to gravity on the planet will be:

Answer»

`(1)/(2)` TIMES that on the surface of the EARTH
`(3)/(4)` times that on the surface ofthe earth
`(5)/(8)` times that on the surface of the earth
`(9)/(10)` times that on the surface of the earth

SOLUTION :`g_(p)=(GM_(p))/(R_(p)^(2)) =(G[M-(10)/(100)M])/((R+(20)/(100)R)^(2))=(Gxx(9M)/(10))/((36R^(2))/(25))`
`g_(p)=(5)/(8)(GM)/(R^(2)) rArr g_(p)=(5)/(8)g`
So the correct CHOICE is (c ).


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