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1. Using the definition of thermal efficiency, show that the coefficient of performance (COP) of a heat pump is always greater than 1.0.
2. If the coefficient of performance of a window air conditioner in the summer is 5.70, what is the coefficient of performance of this unit if it were used as a window heat pump in the winter?
Determine how much farther a person can jump on the moon as compared to the earth if the takeoff speed and angle are the same. The acceleration due to gravity on the moon is one sixth what it is on earth
At what temperature do most cells prefer to live? The calorie is a unit of energy defined as the amount of energy needed to raise 1 g of water by 1°C. A bacterium (which is mostly water) weighs about 1 pg.
If the magnitude of the drift velocity of free electrons in a copper wire is 9.12 10-4 m/s, what is the electric field in the conductor
The front 1.20 m of a 1,350-kg car is designed as a "crumple zone" that collapses to absorb the shock of a collision. What is the magnitude of the average force on the car
when boiling water a hot plate takes an average of 464 seconds to boil 110 milliliters of water. assume the temperature
Dan (a very good sprinter) holds a 5.0-m-long ladder parallel to the ground. He then starts to run, eventually reaching 98% of the speed of light. How long is the ladder according to Carmen, who is standing on the ground as Dan goes by?
A thin rod consists of two parts joined together. One third of it is silver and two-thirds is gold. The temperature decreases by 24C°.
A transformer has input voltage and current of 10 V and 4 A respectively, and an output current of 0.8 A. how many turns are on the primary side
A uniform disc of radius R is spinned to the angular velocity ? and then carefully placed on a horizontal surface. How long will the disc be rotating on the surface if the friction coefficient is equal to k? The pressure exerted by the disc on the..
Light of wavelength 400 nm is incident normally on a film of water 1.0 µm thick. The index of refraction of water is 1.33. What is the wavelength of the light in the water
1000 kg of seawater at 17.5 C and salinity of 3 percent is mixed with 500 kg of pure water with initial temperature 5 C, Determine the final temp C and salinity % of the mixture?
If the spring is stretched to a length of 0.7 m and then released with initial velocity 0, find the position of the mass at any time.
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