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Q. A spring has a spring constant of 30 N/m. How much work is required to stretch the spring 2 cm from its equilibrium position?

Q. A satellite is in a low circular orbit about the Earth (i.e., it just skims the surface of the Earth). How long does it take to make one revolution around the Earth? (The mean radius of the Earth is 6.38 × 10^6 m.)

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