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The heaters inside a winter cabin suddenly fail. Heat is lost to the outdoors the rate of 150 kJ/h, and the electric appliances inside generate 75 kJ/h of heat. The air is initially at 100 kPa and has temperature 30°C with a volume of 10 m3. How long will it take to reach an air temperature of 0°C? (cv = 0.717 kJ/kg-K for an ideal gas @ 300 K). Hint: In reality, the mass of air in the cabin will increase with time. As the air inside cools, it will contract and draw in air from the environment. For simplicity, assume the mass of air inside the cabin is constant, and equal to the mass initially inside.
a boat travels at a constant speed of 15 ms around the circumference of a half circle in a time span of 45 s. what is
air at 80 kpa 300 k and 250 ms enters a diffuser at a rate of 2.5 kgs and leaves at 315 k. the exit area of the
superheated steam at 10 mpa and 480c leaves the steam generator of a vapor power plant. the power plant is operated by
an electronic instrument is to be isolated from a panel that vibrates at frequencies ranging from 25 hz to 35 hz. it is
A light aircraft with a wing area of 200 ft2 has a lift coefficient of 0.4 and a drag coefficient of 0.05. the power required to maintain level flight is 66hp. determine the weight of the airplane. recall power is force in the direction of velo..
a frictionless piston-cylinder is filled with 3 liters of water at 250 kpa. initially the temperature of the water is
one liter of saturated liquid water is contained in a piston-cylinder assembly. initiallythe water pressure is 2bar.
a cam is to be desinged for an automated part loader.using the motion equationsconstruct a chart that tabulates
If the bullets stick to the block and they move together find the velocity of the final system and find the total impulse of each bullet if the movement takes 0.5s before coming to a stop.
a farm equipment manufacturer has a need to actively reduce the vibration of the operators seat using an electrodynamic
Determine the peak runoff from 500 ft of pavement(32ft wide) that drains toward a gutter(for 10 years freq. storm), the pavement slope is .0005, n=.016 and c=.9
a refrigerator compressor compresses 0.5 kgs of saturated r-134a vapor at -10c to 1000 kpa and 40c. the compresser has
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