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Calculate the force of attraction between two balls each of mass 1kg when their centres are 10cm apart. The value of gravitational constant G = 6.67×10^-11 Nm^2 kg^(-2).

(a) 6.67×10^-11N

(b) 6.67×10^-10N

(c) 6.67N

(d) 6.67×10^10 N

The question was asked in class test.

My question comes from Weight of a Body topic in division Mechanical Properties of Solids of Engineering Physics I

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Right answer is (b) 6.67×10^-10N

The best explanation: Force of attraction,

F=G (m1 m2)/r^2 = ((6.67×10^-11)×1×1)/0.10=6.67×10^-10 N.

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