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A 4mx5mx6m room is to be heated by a baseboard resistance heater. It is desired that the resistance heater be able to raise the air temperature in the room from 7 to 23oC within 15 min. Assuming no heat losses from the room and an atmospheric pressure of 100 kPa, determine the required power of the resistance heater. Assume constant specific heats at room temperature.
at t0 a disk with mass 3kg is placed on a spinning platform. the disk slides and begins to accelerate. if the maximum
consider an ideal fuel cell to be run on pure oxygen and hydrogen for a length of time. determine the ration of the
the shaft is made of a992 steel with the allowable shear stress of tauallow 75 mpa. if gear b supplies 15 kw of power
a piston cylinder device contains 0.5 kg of water at 1.0mpa and 400oc. now it is cooled to 1mpa in sat-v phase.
a 1-m3 rigid tank initially contains air at 150 kpa 300 k. the tank is connected through a valve to a supply line at
a manufacturing firm needs to manufacture cylindrical components on a cnc lathe. the differential between the incoming
An air compressor takes air from outdoors at 28deg C and 101.2kPa and compresses it to 790kPa and 50 deg C. The air input to the compressor is found to be 22.67m3/hr. Estimate the required Hp to operate the compressor.
suppose you have a choice between a straight triangular or rectangular fin constructed of aluminum with a base
as shown a rope is attached to a l5.00 m high shed that is to be relocated. a man pulls on the end of the rope at point
air is compressed under steady flow conditions see figure q3. the power input to the compressor is 3 kw. during the
air at t11300 0r p116 lbfin2 enters a counterflow heat exchanger operating at steady state and exits at p214.7 lbfin2.
A cooking pan whose inner diameter is 20 cm is filled with water and covered with a 4-kg lid. If the local atmospheric pressure is 101 kPa, determine the temperature at which the water starts boiling when it is heated.
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