1.

The height at which the weight of a body becomes 1//16^(th), its weight on the surface of earth (radius R), is:

Answer»

4 R
5 R
15 R
3 R

Solution :`(W_(2))/(W_(1))=(mg_(2))/(mg_(1))=(g_(2))/(g_(1))=(R^(2))/((R+R)^(2))`
`(1)/(16)=(R^(2))/((R+R)^(2)) rArr (1)/(4)=(R )/(R+h)`
`R+h=4R`
`h=3R`.
THUS correct choice is (d).


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