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As a engineer, you are designing a heat pump that is capable of delivering heat at the rate of 22 kW to a house. The house is located where, in January, the average temperature is ?10°C. The temperature of the air in the air handler inside the house is to be 41°C.
(a) What is the maximum COP for a heat pump operating between these temperatures?
(b) What must be the minimum power of the electric motor driving the heat pump be?
(c) In reality, the COP of the heat pump will only be 60 percent of the ideal value. What is the minimum power of the electric motor when the COP is 60 percent of the ideal value?
If an automobile rounds this curve at 30 {rm m/s}, illustrate what is the minimum coefficient of static friction between tires and road needed to prevent skidding?
A 2.4kg toy locomotive is pulling a 1.6kg caboose. The frictional force of the track on the caboose is 0.54N backward all along the track. If the train is accelerating forward at 3 m/s2, what is magnitude of the force exerted by the locomotive on ..
A certain kind of glass has an index of refraction of 1.648 for blue light of wavelength 439 nm and an index of refraction of 1.619 for red light of wavelength 677 nm
Coherent light that contains two wavelengths, 660 nm and 470 nm, passes by two narrow slits with a separation of 0.280 mm and an interference pattern is observed on a screen which is a distance 4.40 m from the slits.
On an air track, a 402.0g glider moving to the right at 2.25m/s collides elastically with a 498.0g glider moving in the opposite direction at 2.90m/s. Find the velocity of second glider after the collision
How might a magician make the Statue of Liberty disappear? Imagine that you are sitting with some spectators on a circular platform that, unknown to all of you, can rotate very slowly. It is evening, and you can see the Statue of Liberty a short dist..
Inside the tube is a uniformelectric field of 4.50*10-4 N/C pointing in negativey-direction. How far does the particle travel before hitting the tube wall.
A person notices a mild electric shock if the current along a path through the thumb and the index finger exceeds 80.0, Calculate the maximum allowable voltage with a wet-skin resistance of 1920
What is the greatest possible distance from the wall
A 3.00 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 2.20 m/s2, find out the force exerted by the rope on bucket of water.
Charges of -11.5 nC and -22.1 nC are separated by 0.733 m. What is the potential midway between the two charges?
The population of a community was 12500 in 1985 and 36000 in 2000. Find the time it takes the population of this town to double
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