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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?
It is known that a horizontal curve starts (has PC) 90m before the vertical curve's PVC. If the superelevation of the horizontal curve is .08 and the central angle is 38 degrees what is the station of the PT
a spherical balloon inflated sos that the volume is increasing at the rate of cubic meter/min. At what rate is the diameter increasing when the diameter is 12 m?
Locate the centroid y of the cross-sectional area for the angle. Set a = 9in ., b = 27in . Find the moment of inertia I_{x'} about the x' centroidal axis.
Calculate uniform load (in addition to self wt.) which will cause the section to begin cracking
A bridge has cylindrical piers 1 m in diameter and spaced 15 m apart. Downstream of the bridge where the flow disturbance from the piers is no longer present, the flow depth is 2.9 m and the mean velocity is 2.5 m/s.
Solar cookers can be used in less developed countries for cooking and also for thermal disinfection of water. To disinfect water, the water must be heated to about 35 Celsius for 5 hours. Of course, it takes time to raise the temperature of the wa..
a dry cleaning establishment buys 500 gal of carbon tetrachloride every month. as a result of the dry cleaning operation, most of this is lost to the atmosphere and only 50 gal remain to be disposed of.
If friction between the cars and the rails is neglected, what were the magnitude and the direction of the velecity of the cars after the collision?
The jib crane supports a load of 750 lb from the trolley which rides on the top of the jib. The members of the crane are pinned together at B, E, and F and supported by a short link BH.
Assume the specific gravity is 2.7. Given this information, determine (a) the phase diagram of the soil, (b) the void ratio, (c) the porosity, (d) the dry density, and (e) the saturated density.
assuming the entire system has reached equilibrium what is the distance that must be used between the inputs shown and
Derive formulas to show that normal stresses in rods (1) and (2) are independent of the material used in rods, as long as they have the same modulus of elasticity, that is, E_1 = E_2.
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