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Q. An ore car of mass 4 000 kg rolls downhill on tracks from a mine. At the end of the tracks, 10.0 m lower in elevation, is a spring with k = 400 000 N/m. How much is the spring compressed in stopping the ore car? Ignore friction.

Q. A spherical steel ball bearing has a diameter of 2.540cm at 25C. What is its diameter when its temperature is raised to 100C?

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