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The lowest temperature that has been achieved is about 1 × 10-6 K. To achieve this an additional stage of cooling is required beyond that described in the previous problem, namely nuclear cooling. This process is similar to magnetic cooling, but it involves the magnetic moment associated with the nucleus rather than that associated with certain ions in the paramagnetic salt. Suppose that 10 µJ is to be removed from a specimen at an average temperature of 10-5 K (ten microjoules is about the potential energy loss of a pin dropping 3 mm). Find the work input to a Carnot heat pump and its coefficient of performance to do this assuming the ambient is at 300 K.
given that the relaxation time a is 177.46 days what is the activation energy of a rubber band if the pre-exponential
five 100 ohm resistors each having 5 tolerance are connected in series. what is the overall nominal resistance and
a power plant produces a flue gas with a mass flow rate of 2 million pounds per hour. of that 150000 lbhr is water
A jack-screw has a handle 35 inches long and a pitch of 7/32 inches. If a pull of 15 lbs. is required at the end of the handle to lift a 3,000 lbs.
a total of 2.00 mol of a compound is allowed to react in a foam coffee cup that contains 138 g of water. the reaction
a cup of coffee 12oz 0.0125 ft3 that is at 140 degrees f sits on a desk. after some negligable time the final
a gasoline powergen consists of a gasoline engine designed to convert the chemical energy chee of gasoline to
two kg of air is contained in a piston-cylinder assembly. the initial volume is 0.01m3 and pressure is 10 bar. the air
what is the cw when i10 per year of 1500 per year starting in year one and continuing forever and 10000 in year five
a cylindrical bioreactor of diameter 3 m has four baffles. a marine impeller mounted in the reactor has a diameter 13
a 25 mm diameter uniform steel shaft is 600 mm long between bearings.a find the lowest critical speed of the shaftb if
Mainframe computing used to be the only way to manage enterprise data. Then personal computers changed the data management scene. How do these two computing styles differ, and how did shift to PC-based computing evolve.
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