Two spheres A and B of mass 7.5 kg and 6.3 kg respectively are separated by a di

Question

Two spheres A and B of mass 7.5 kg and 6.3 kg respectively are separated by a distance of 0.59 m.

    (a) Calculate the magnitude of the gravitational force A exerts on B and B exerts on A.

force A exerts on B       N

force B exerts on A       N

Two spheres A and B of mass 7.5 kg and 6.3 kg respectively are separated by a distance of 0.59 m. Calculate the magnitude of the gravitational force A exerts on B and B exerts on A. force A exerts on B force B exerts on A If the force between the spheres is now 3.50 times 10-9 N, how far apart are their centers?

Explanation / Answer

a) F = Gm1m2/r^2

F = 6.67x10^-11*7.5*6.3/0.59^2 = 9.0536x10^-9 N

force exterted by B on A = F =9.0536x10^-9 N

force exterted by A on B = F = 9.0536x10^-9 N

b) F = 3.5x10^-9 N

G7.5*6.3/r^2 = 3.5x10^-9

r^2 = 0.9

r = 0.94892 m

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