Find theoretically smallest motor to operate freezer
A household freezer operates in a room at 20ºC. Heat must be transferred from the cold space at a rate of 2 kW to maintain its temperature at -30ºC. What is the theoretically smallest (power) motor required to operate this freezer?
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A company manufactures 13 types of cars. Prior to full-scale production, 4 of each type are made, and a sample of 5 cars undergo crash testing. The sales department is happy if one of each type remains for display, and quality control is happy if
The percentage of silver impurity in a lead sample was determined by the following procedure: A sample of lead weighing 1.050 g was dissolved in nitric acid to produce an aqueous solution of Pb2+ and Ag+.
The runner must then accelerate at 0.20 m /s^2 for how many seconds in order to achieve the desired time?
Find the probability that they all will decide to go tomorrow, in which case DisneyWorld has more than 5.4 million people in line when it opens in the morning.
A household freezer operates in a room at 20ºC. Heat must be transferred from the cold space at a rate of 2 kW to maintain its temperature at -30ºC.
If the ground state electron configuration of an element is [Ar]3d^10 4s^2 4p^4, what is the typical charge on the monatomic anion of the element ?
Find the range, standard deviation and variance for the following data set. Enter ONLY the data value into the answer blank. You do not need to enter Variance = 4.2. Just enter the 4.2. Obviously 4.2 is not the variance for this data set.
A 75m-long train begins uniform acceleration from rest. The front of the train has a speed of 23 m/s when it passes a railway worker who is standing 170m from where the front of the train started.
What is the maximum thermal efficiency? What is it if the collector is redesigned to focus the incoming light to produce a maximum temperature of 300ºC?
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