Selective breeding is slow and painstaking compared to the new methods of plant improvement, like genetic engineering
Indicate whether the statement is true or false
T
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Mr. Allison has 895 acres of farmland. Eighty-eight percent of the farmland is planted in grain. Fifty-five percent of the grain planted is corn.
a. How many acres are in grain? b. How many acres are in corn?
Technician A says the sun gear in a planetary gear set is the central gear. Technician B says planet gears are in constant mesh with the sun and ring gears. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
California condors are in the vulture family and eat mainly plants
a. True b. False Indicate whether the statement is true or false
A) Find ?H and ?S for the gas as it travels through the compressor, and also find the amount of work Ws done by the compressor per mole of gas. B) The gas leaving the compressor is then condensed, after which it goes through a throttling valve that drops the pressure back to 0.3 atm, and then returns to the boiler. Find the amount of heat removed in the condenser (QH) per mole of refrigerant and the coefficient of performance of this refrigerator. C) What would be the coefficient of performance of a CARNOT refrigerator that operated between 275 K and 330 K?
A refrigerator operates according to the vapor-compression cycle. The amount of heat added in the boiler is 6500 Joules per mole of refrigerant. The vapor leaving the boiler is an ideal gas with a constant CV*=(5/2)R. This gas enters the compressor at P=0.3 atm and T=275 K and leaves at P=0.5 atm and T=330 K.