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A passive solar house that is losing heat to the outdoors at an average rate of 50,000 kJ/h is maintained at 22 C at all times during a winter night for 10 hours. The house is to be heated by 50 glass containers each containing 20 L of water heated to 80 C during the day by absorbing solar energy. A thermostat-controlled 15-kW back-up electric resistance heater turns on whenever necessary to keep the house at 22 C. (a) How long did the electric heating system run that night? (b) How long would the electric heater have run that night if the house incorporated no solar heating?
the truck is to be towed using two ropes. if the resultant force is to be 950 directed along the positive axis
if you measured the time it takes for the construction elevator to go from a to b the b to c and then c to d and you
an aluminum transmission line with a diameter of 20mm has an electrical resistance of r 2.636x10-4 ohmsm and carries
The direction of the forces are 0,-30 and +120 degrees from the positive X axis. Determine the magnitude and direction of the resultant force.
the yield of a chamical process is being studied. from previous experience with disprocess the standart deviation of
assuming that r-134a is an ideal gas what would the specific volume of r-134a at 40 deg c and 0.06 mpaabsolute? how
A paper clip is made of wire 0.7 mm in diameter. If the original material from which the wire is made is a rod 25 mm in diameter, calculate the longitudinal engineering strain and true strain that the wire has undergone during processing.
to place a communications satellite into a geosynchronous orbit at an altitude of 22240 mi above the surface of the
the accerleration of a particle is defined by the relation a a - 6t2 where a is constant. at t 0 the particle starts
the density of air is to be determined by measuring its pressure and temperature for insertion in the ideal gas
a 120 lbm base jumper extreme parachutist leaps from el capitan in yosemite national park 3000 ft vertical drop head
a mummy picks up a calculator and starts adding odd whole numbers together in order 135....etc. what will be the last
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