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A passive solar house that is losing heat is outdoors at an average rate of 50,000 kJ/h is maintained at 22oC at all times during a winter night for 10h. the house is to be heated by 50 glass containers each containing 20 L of water this is heated to 80oC during the day by absorbing solar energy. a thermostat-controlled 15-kW back-up electric resistance heaters turns on whenever necessary to keep the house at 22oC.
A.) how long did the electric heating system run that night?
B.) How long would the electric heater run that night in the house incorporated no solar heating?
To determine the effect of fuel grade in fuel efficiency, 80 new cars of the same make with identical engines, were each driven for 1000 miles. Forty of the cars ran on regular fuel, and the other forty received premium grade fuel.
A flexure test is done to determine the modulus of rupture of wood. Given that a=15in, L=34in, and the maximum load P that was applied was 5950lbf, what is the modulus of rupture of wood
A river is 2 m deep. The river bed consists of a depth of sand of saturated unit weight 20 kN/m^3. What is the effective vertical stress 5 m below the top of the sand
An aerosol with a lognormal size distribution has a count median diameter of 2.0 micron and a geometric standard deviation of 2.2. If the mass concentration is 1 mg/cubic meter what is the number concentration
Calculate the pH of a 1-L solution containing 0.01 M sodium acetate after the addition of 3 mL 0.5 M H2SO4
Calculate the compressive stress (in psi) for a 6-in diameter by 12-in high concrete test specimen if the total deformation under load is 0.015 in. Calculate the total load on the test cylinder stress.
Derive an expression relating effluent concentration to influent concentration, hydraulic residence time, and the reaction rate constant for a zero order reaction in a CSTR at stead-state.
the turbopump unit in the engine nominally operates at 7000 rpm, and a result of design issue, the actual thrust provided by the engine oscillates harmonically with an amplitude of 10 KN at the same rotational frequency as the turbopump unit.
The cylinder B is released from rest. Determine the speed of both masses (vA and vB) after B moves by h m. Also calculate the angular displacement for the pulley D. The diameter of the pulley D is 0.2 m. Neglect all friction.
Draw a graph showing the effluent concentration as a function of time for : a. Zero order CMFR and PFR with the same influent concentration and reaction rate. b. First order CMFR and PFR with the same influent concentration and reaction rate.
For a ternary system, three components are present; temperature is also a variable. What is the maximum number of phases that may be present for a ternary system, assuming that pressure is held constant
suppose you apply a force of 14.4 N to a spring and it stretches 2.4 cm. what is the spring constant?
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