Find smallest motor need for a heat pump absorbing heat
In a cryogenic experiment you need to keep a container at -125 C, although it gains 100 W due to heat transfer. What is the smallest motor you would need for a heat pump absorbing heat from the container and rejecting heat to the room at 20 C?
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Arvin the Ant is on a picnic table. He travels 30 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the magnitude of Arvin's net displacement?
An air conditioner provides 1 Kg/s of air at 15 C cooled from outside atmospheric air at 35 C. Estimate the amount of power needed to operate the air conditioner. Clearly state all assumptions made.
The time for a professor to grade an exam is normally distributed with a mean of 12.6 minutes and a standard deviation of 2.2 minutes. The interval around the mean that contains 95% of the times needed to grade exams is
It is estimated that 56% of the children between the ages of 3 and 5 years are already enrolled in school. In a sample of 350 children what is the probability that at least half are enrolled in school?
What is the smallest motor you would need for a heat pump absorbing heat from the container and rejecting heat to the room at 20 C?
The manufacturing of semiconductor chips produces 2% defective chips. Assume the chips are independent and that a lot contains 1000 chips.
Heat transfer by radiation, conduction, and convection with the ambient surroundings thus cycles the water temperature. Is such a cyclic process reversible or irreversible?
Consider two independent variables X and Y, where X is uniformly distributed on the interval [-1,1] and Y is exponentially distributed with mean 3. Find the joint density function for the pair (X, Y).
Consider a thin-walled aluminum tube of 2.600-in outside diameter, wall thickness of 0.004-in , length of 3.5-in, and yield strength of 37,700psi, determine the torque at which the tube will fail in torsional buckling.
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