1.

The weight of a body on surface of earth is 12.6N. When it is raised to a height half the radius of earth, its weight will be

Answer»

`2.8`N
`5.6`N
`12.6`N
`25.2`N

Solution :Weight of BODY on the surface of earth mg `=12.6`N
At height h, the VALUE of g. is given by g.`=g(R^(2))/((R+h)^(2))`
Now `h=R//2`
`:. g.=g((R )/(R+(R//2)))^(2)=(4)/(9)g`
Weight at height `h=(4)/(9)mg=12.6xx(4)/(9)=5.6`N


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