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Q. Calculate the pressure amplitude (in N/m2) of a 500 Hz sound wave in helium if the displacement amplitude is equal to 5 x 10^-8 m. (rho = 0.179 kg/m3, v = 972 m/s.)

Q. A 4.70 e2 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 multiplied by 104 J of work on the balloon in the process. At what height above the surface of the earth does the balloon have a speed of 8.50 m/s?

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