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Which among the following is the correct formula for gravitational force?

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+2 votes
in Fluid Mechanics by (118k points)
Which among the following is the correct formula for gravitational force?

(a) F= Gm1m2/r^2

(b) F= Gm1m2

(c) F= m1m2/r^2

(d) F= Gm1m2/r^3

I had been asked this question in semester exam.

The origin of the question is Types of Forces Acting in Moving Fluid in chapter Dimensional and Model Analysis of Fluid Mechanics

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The correct option is (a) F= Gm1m2/r^2

Best explanation: Gravitational force was derived by Newton’s theory of gravitation. It is defined as the product of mass and acceleration due to gravity of the fluid flow. It is mainly present in cases of open surface fluid flow.

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