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The electric heating systems used in many houses consist of a simple duct with electrical resistance wires. Air is heated as it flows over the wires while a current passes through. Consider a 15-kW electric heating system. Air enters the heating section at 100 kPa and 17 C with a volumetric flow rate of 2.5 m3/s. If air leaves the duct at 22 C, determine the heat that was lost from the air to the surroundings in WATTS.
a small sphere of reference-grade iron with a specific heat of 447 jkgk and a mass of 0.515 kg is suddenly immersed in
a chromel-alumel thermocouple junction which can be approximated with a sphere has an effective diameter of 1 mm. it is
calculate the work necessary to compress air in an insulated cylinder from a volume of 6 ft3 to a volume of 1.2 ft3.
an alcohol solution contains 6 by mass ethanol. this solution is fed to a distillation column at a rate of 1000 kgh.
Please find the mass of gasoline fuel injected into each cylinder in each working cycle.
Carbon fibre reinforced polymers (CFRP have been used extensively in aerospace applications due to their excellent strength to weight and stiffness to weight properties.
Design a bridge that will withstand 4 fully loaded semi-trailers
in a rankine cycle steam leaves the boiler at 400 celsius and 5mpa. the condenser pressure is 0.01mpa. the water
steam having a mass of 3kg and initially at 2.5mpa and 350degc has 2460kj of heat removed at constant temperature until
a 6-km cast-iron new pipeline conveys 320 lsec of water at 30 degrees celsius. if the pipe diameter is 30 cm compare
the acceleration of a particle moving along a straight line is inversely proportional to its speed with the constant of
Determine the maximum normal stress in a 300-mm diameter basketball that has a 2-mm wall thickness after it has been inflated to a pressure of.
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