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Q. A spring (k =805N/m) is hanging from the ceiling of an elevator, and a 5.0-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.47m/s2?

Q. A sound wave travels twice as far in neon (Ne) as it does in krypton (Kr) in the same time interval. Both Neon and Krypton can be treated as monatomic ideal gases. The atomic mass of Neon is 20.2u, and that of krypton is 83.8u. The temperature of the krypton is 293K. What is the temperature of the neon?

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