Created by StemPy LabAn ideal gas is held in one half of a rigid, insulated box. The other half is empty (a vacuum). The partition is suddenly removed and the gas fills the whole box. For this free expansion, which statement is correct?
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← Air flows past an aeroplane wing at 70 m/s over its upper surface and 60 m/s under its lower surface, as shown in the figure. The wing has an area of 20 m², and the density of air is 1.2 kg/m³. Using Bernoulli's principle, the upward lift on the wing is closest toThe mean free path of the molecules of a gas is λ. If the pressure is doubled at constant temperature, and separately if the temperature (in kelvin) is doubled at constant pressure, the mean free path becomes →
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