Raising the water temperature
Consider a tank containing 40.0 kg of water. Neglecting the heat capacity of the tank, how much heat (in joules) would be required to raise the water temperature of from 1 to 94 degrees Celsius?
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A short bar magnet placed with its axis at 30º with a uniform external magnetic field of 0.25 T experiences a torque of magnitude equal to 4.5 × 10-2 J. What is the magnitude of magnetic moment of the magnet?
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The tank eventually reaches room temperature of 25 degree C. If the air inside is allowed to escape without any heat transfer to the environment unit reaches a pressure of 200 KPa, find the remaining mass of air in the tank and its temperature.
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