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Grade: 12th Pass
        Where will a body weigh minimum ?

(A) at a height of 100 m above the earth?s surface
(B) at the earth?s surface
(C) at a depth of 100 m below the earth?s surface
(D) 50 m below the earth surface
8 years ago

Answers : (2)

Sudheesh Singanamalla
114 Points
							

use the formulas

g ( at a height h) = g (on surface ) * [ 1 - (2h/Re) ]

g ( at a depth d ) = g (on surface) * [ 1 - (d/Re) ]

(i) using this for the 1st part g(at height h) = 9.702

(ii) g (at surface) = 9.8

(iii) g (depth of 100m) = 9.79

(iv) g (depth of 50m) =  9.8

 

therefore the body will weigh minimum at a height of 100 m  above the earth's surface !

answer is (A) .

Please approve

8 years ago
Ritvik Gautam
85 Points
							

Force of gravity is maximum at the earth's surface and decreases as you go away from the earth's surface.(It is zero at the earth's surface)

Also,

W=mg

therefore, when g will be minimum, weight will be minimum, since mass is constant.

The body weight will be minimum at a height 100m above the earth's surface and 100m below the earth's surface.

 

 

Please Approve!!

8 years ago
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