Two charged spheres are 8.45cm apart. they are moved and, Ask an Expert

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Q. On an essentially frictionless horizontal ice-skating rink, a skater moving at 3.00 m/s encounters a rough patch that reduces her speed by 45% to a friction force that is 25% of her weight. Use the work-energy principle to find the length of the rough patch.

Q. Two charged spheres are 8.45 cm apart. They are moved, and the force on each of them is found to have been tripled. How far apart are they now.

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