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Q. A light spring with a spring constant of 80.0 N/m rests vertically on a table. A 2.00 g balloon is filled with helium (0°C and 1 atm pressure) to a volume of 5.00 m3 and connected to the spring, causing the spring to stretch and expand. How much does the spring stretch when the balloon-and-spring system is in equilibrium? (The density of helium is 0.179 kg/m3)

Q. How much internal energy is generated when a 30.0-g lead bullet, traveling at 6.00 102 m/s, comes to a stop as it strikes a metal plate?

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