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A 1.5 kilowatt heater is to be used to heat a room with dimensions 3.5 m × 5.0 m × 3.0 m. There are not heat losses from the room, but the room is not airtight, so that the pressure in the room is always atmospheric. Consider the air in the room to be an ideal gas with Cig = 29 J/mol K, and its initial temperature 10 C.
a) Assuming that the rate of heat transfer from the air to the walls is small, what will be the temperature in the room 5 minutes after the heater is turned on?
b) What would be the temperature in the room 5 minutes after the heater is turned on if the room were hermetically sealed?
The nominal breaking strength of the rope is 10,000 lbs. Calculate how much payload this assembly can allowably pick up. Show your work.
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Is there an economic case for renewable energy? This issue was recently a "hot topic" in the news, and you are referred to the following newspaper article for a representation from the media.
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One side of a mercury manometer is connected to the top of frictionless piston-cylinder storage tank containing 1500 liters of oil, the other side is open to the atmosphere. The difference in the height of the column of mercury in the manometer is 90..
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Determine the number of pounds of helium within it if its volume = 68,000 ft^3 and the temperature and pressure are 80 F and 14.2 psia.
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