# Physics

Two spheres are attached to two identical springs and
separated by 8.0 cm, as in Figure 14. When a charge of
2.5 106 C is placed on each sphere, the distance
between the spheres doubles. Calculate the force constant
k of the springs.

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1. from the center each sphere moves 8 - 4 = 4 cm = .04 m
that is how far each spring is compressed.
F = k x = 0.04 k
now what is the electrostatic force when the spheres are 16 cm = 0.16 meters apart?
F = [ 9*10^9 ] Q1Q2/(0.16)^2
so
0.04 k = [ 9*10^9] [ 2.5*10^6] [2.5*10^6] / [ 1.6^2*10^-2 ]
Those charges are huge. Typo?

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