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Q. A balloon of volume 3.6 m3 contains argon gas at a pressure of 6.6 x10^5 Pa and room temperature (200 C). What is the total internal energy of gas?

Q. When the air temperature is below 0, the water at the surface of a lake freezes to form a sheet of ice. If the upper surface of an ice sheet 24.60 cm thick is at -10.30 Celsius and the bottom surface is at 0.00 Celsius, compute the time it will take to add 2.20 mm to the thickness of this sheet.

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