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a) An inventor claims to have developed a refrigeration unit with a COP of 8.5 which maintains the refrigerated space at -10oC while operating in a room where the temperature is 25oC. Can this claim be correct?
b) Consider an engine in outer space which operates on the Carnot cycle. The only way in which heat can be transferred from the engine is by radiation. The rate at which the heat is radiated is proportional to the fourth power of the absolute temperature and to the area of the radiating surface. Show that for a given power output and a given TH, the area of the radiator will be a minimum when TL/TH = ¾. (with sketches)
two 415000-lb locomotives pull 41 205000-lb coal hoppers. the train starts from rest and accelerates uniformly to a
water is the working fluid in a regenerative rankine cycle. the pressure and temperature at the turbine inlet are 8mpa
Design a high pressure homogenizer for the manufacture of 10^6 kg per year of salad dressing.
a coin of diameter 2.5 cm is placed concentrically at the bottom of a can 5 cm in diameter and 10 cm high. the coin is
gold au forms a substitutional solid with silver ag. compute the weight percent of gold that must be added to silver to
a pump increases the water pressure from 70 kpa at the inlet to 700 kpa at the outlet. water enters this pump at 15
a group of students launches a model rocket in the vertical direction. based on tracking data they determine that the
a machine with a rotating shaft has a total weight of 90 kg and is supported by springs. the damping constant for the
if the resultant force .middotr is directed along anbspline measu red 75 clockwise from the positie x axis andnbspthe
An outside wall of a building is constructed of 1/2 inch gypsum sheeting, 8 inches of concrete block (hollow, 3 oval core), and 4 inches of common brick. The inside of the building is maintained at 75F dry-bulb temperature and 65F wet-bulb temperatur..
A block weighing 80 N is resting on a plane inclined 20 degree to the horizontal. The coefficient of static friction is 0.5. Determine the friction force on the block. What is the maximum available friction force?
A pressure transducer has a damping ratio of 0.3 and a natural frequency of 12,000 Hz. Determine the frequency range for which the amplitude dynamic error will be less than 10 percent.
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