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At winter design conditions, a house is projected to lose heat at a rate of 60,000 Btu/h. The internal heat gain from people, lights, and appliances is estimated to be 6000 Btu/h. If this house is to be heated by electric resistance heaters, determine the required rated power of these heaters in Btu/h to maintain the house at constant temperature.
Methane is completely burned with 20% excess air, with 30% of the carbon going to CO. What is the partial pressure of the CO in the stack gas if the barometer reads 740 mm Hg, the temperature of the stack gas is 300°F.
an 8-kg iron casting at 550 degc is quenched in a tank containing 0.03 m3 of liquid water initially at a temperature of
an insulated cylinder is initially divided into halves by a frictionless thermally conducting piston. on one side of
an automobile having a mass of 2000 kg deflects its suspension springs 0.02 m under static conditions. Determine the natural frecuency of the automobile in the vertical direction by assuming dumping to be negligible.
a tennis ball is initially at a height of 4 m above a solid marble floor. the tennis ball is traveling 15 msec at an
a full revolution press has 100 rpm flywheel rotation. the press is equipped with tow hand trip devices mounted on the
When one mole of argon gas is bubbled through a large volume of an Fe-Mn melt of xMn = 0.5 at 1863 K evaporation of Mn into the argon causes the mass of the melt to decrease by 1.5 g. The gas leaves the melt at a pressure of 1 atm. Calculate the acti..
Cracks propagate when the stress intensity factor exceeds a critical value and describe the fracture behaviour of the insulation tape loaded with a small crack.
explain why a high quality software process should lead to high quality software product.discuss possible problems with this system of quality management.
Assume that the charge cooler incoming cooling water is at 45 oC and its effectiveness is 80% and the air pressure loss in charge cooler is 10 kN/m2, calculate the air temperature and density at the outlet of the charge cooler. Estimate the % increas..
Calculate the change in velocity required in changing the position of a satellite in an orbit by 90 degrees. The initial and final orbit is circular around the Earth with a 15000 km radius. Calculate the delta velocity, semi-major axis and period for..
The normal force which the path exerts on a particle is always perpendicular to the _________ The equation of motion for a system of n-particles can be written as ?Fi = ? miai = maG, where aG indicates _______. Newton’s second law can be written in m..
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