NEET-XII-Physics
neet 2020 questions with solutions year:2020
- #8A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth?
(A)48 N
(B)32 N
(C)30 N
(D)24 N
digAnsr: BAns : `` w_{s}=mg_{s}=72\,N ``
`` w_{h}=mg_{h}=\frac{mg_{s}}{\left(1+\frac{h}{R}\right)^{2}} ``
`` =\frac{72\,N}{\left(1+\frac{R /2}{2}\right)} ``
`` =\frac{72}{9 /4} ``
`` w_{h}=32\,N ``