Calculate the temperature of air after throttling
Air at 300 K and 200 kPa is throttled by a valve to pressure of 100 kPa. If the valve is adiabatic and the change in kinetic energy is negligible, calculate the temperature of air after throttling.
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A dolphin in 25°C sea water emits a sound directly toward the bottom of the ocean 105 m below. How much time passes before it hears an echo? (The speed of sound in sea water is 1530 m/s.)
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The charges repel each other so that the angle between each string and the vertical is 30? Find the charge on each ball, assuming they are equal.
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