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A power cycle operates between a lake's surface water at a temperature of 300l and water at a depth whose temperature is 285 K. at steady state the cycle develops a power output of 10KW, while rejecting energy by heat transfer to the lower temperature water at the rate 14,400 KJ/min. determine the thermal efficiency of the power cycle and the maximum thermal efficiency for any such power cycle.
An AC power generator produces 54 A (rms) at 3600 V. The voltage is stepped up to 100000 V by an ideal transformer, What percentage of the power delivered by the generator is dissipated as heat in the power line
an alpha particle has a charge of 2.00e. how much work is required to move this particle across a potential difference of 2270 volts?
The driver of a car travelling at a speed of 144.0 km/hr along a horizontal road suddently hits the brakes. how far will the car travel before stopping
Heather and Jerry are standing on a bridge 60m above a river. How much time elapses between the first splash and the second splash
Estimate the fraction of electrons excited above the fermi level at room temp for Aluminum. The effective mass of Al is 1.0xm, where m - free electron mass
q1. a man pushes the lawn mower on a level lawn with a force of 240 n. if 40 percent of this force is directed downward
A particle of mass m is in an infinite square well of width L. determine the allowed energies for the system
If a spaceship is approaching the earth at 0.24c, what is the speed of the capsule relative to the ship
A wood block floats on water with 35% of its volume above the surface (of water), what is the average density of the block (in kg/m3)
A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. what is the smallest insect a bat can detect
An electric motor rotating a workshop grinding wheel at a rate of 8.20 101 rev/min is switched off. Through how many radians has the wheel turned during the interval found in (a)
A beam of 16MeV deuterons (m=2mp) from a cyclotron falls on a copper block. The beam is equivalent to a current of 15 microA. At what rate is thermal energy produced in the block
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