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Q. A thin, uniformly charged spherical shell has a potential of 720 V on its surface. Outside the sphere, at a radial distance of 29.0 cm from this surface, the potential is 434 V.

Calculate the radius of the sphere.

Q. The springs of a 1100 kg car compress 3.5 mm when its 68 kg driver gets into the driver's seat. If the car goes over a bump, what will be the frequency of vibrations?

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