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QNEET-2020-Ph-710: NEET 2020 Physics - Class 11 NEET-2020-Ph-710 Solution: A body weighs 72 N on the surface of the earth. What is the…
A 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? 32 N 30 N 24 N 48 N
Multiple Choice Options
- A 32 N
- B 30 N
- C 24 N
- D 48 N
Step-by-Step Verified Solution
We know W = mg
At a height h, above the surface of earth, weight is given as,
m g h = m g [ ( 1 + h R ) 2 ]
= 72 ( 1 + R / 2 R ) 2
= 72 ( 3 2 ) 2
= 4 9 _ 72 = 32 N