Question

Hey all!!
Good morning!
Please answer my question !

Q) The value of ‘g’
a) Increases as we go above the earth’s surface
b) Decreases as we go to the centre of the earth
c) Remains constant
d) Is more at equator and less at poles ​

Answer 1

Answer:

b)

Explanation:

g means acceleration due to gravity

Let the mass of earth be M and a body placed at its surface be m and the gravitational force between them be F. Distance between the object and centre of earth be r

so, by Universal law of gravitation

F= GMm/ r^2 where G is gravitational constant

F= GMm/r^2 ----(i)

since mass of object is negligible in respect to the mass of earth

so, it is taken as 0

F= GM×0/r^2 [from (i)]

mg=0 [by Newton's 2nd law of motion F=ma, where a=g]

g=0/m

g=0

So value of g at the surface of earth is zero

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