How long would a space heater have to run
How long would a 2.90 kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance = 2.68) does when it freezes 1.73 kg of water at 18.8°C into ice at 0°C?
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A worm gear set has a velocity ratio of 0.05. The worm has two teeth, a lead of 3 in., and a pitch diameter of 1.5in. Determine the helix angle and pitch diameter of the worm gear.
Calculate the ratio of the number of primary windings of the transformer to the number of secondary windings of the transformer.
A coil is connected to a 60 Hz ac generator with a peak emf equal to 80 V. At this frequency the coil has an impedance of 14 and a reactance of 12 . (a) What is the peak current in the coil?
Suppose telephone calls arrive at an emergency hotline at a rate of 5 per hour , and you begin monitoring calls at time t = 0 ( in hours )
If the 160-lb person jumps directly off the back of the boat with a velocity of 7 ft/s, determine the resulting velocity of the boat and remaining person.
To deposit 14000 J of heat in the house, the heat pump requires 796 J of work. Determine the temperature of the well water. Give answer in K. Do not enter unit.
Consider a Rankine cycle operating in an ideal reheat mode where the high pressure turbine receives steam at 8MPa and 450 deg. C; the low-pressure turbine is operated at 500kPa ond 500 deg.
An engine has a hot reservoir temperature of 935 K and a cold reservoir temperature of 616 K. The engine operates at three-fifths maximum efficiency. What is the efficiency of the engine?
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