Two charged spheres are 15 cm apart. they are moved and the, Ask an Expert

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Q1. A 210 ball and a 670 ball are connected by a 45 cm long massless, rigid rod. The structure rotates about its center of mass at 110 rpm. What is the rotational kinetic energy?

Q2. Two charged spheres are 15 cm apart. They are moved, and the force on each of them is found to have been quadrupled. How far apart are they now?

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