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A typical house is built on a cement slab with four walls and a roof. The thermal conductivities of the four walls, the roof, and slab are Kw, Kr, and Kf with thickness Lw, Lr, and Lg respectively. You may assume that the walls, the roof, and the cement slab have the same surface area. In a hot summer night, the outside temperature is To=120ºF and the ground temperature is Tg=65ºF. The interior of the house is maintained at Ti=75ºF by an air condition unit working continuously.
1) Calculate the rate of heat exhausted by the air condition unit.
2) Suppose the air condition unit is operated at its maximum efficiency (in a Carnot cycle) with a coefficient of performance, E. What is the power consumption of the air condition unit?
A coiled telephone cord forms a spiral with 74.0 turns, Determine the self-inductance of one conductor in the unstretched cord
A child is playing by jumping on a bathroom scale. The mass of the child is 31 kg and when he stands on a bathroom scale, the spring inside the scale compresses 0.46 mm. what is the maximum height the child can jump on the scale
A sealed cubical container 17cm on a side contains three times Avogadro's number of molecules at a temperature of 16°C. Find out the force exerted by the gas on one of the walls of the container.
A traveling wave in a string of linear 0.01kg per meter isdescribed by the wave function y=0.02m Sin(50rad/m x - 1750rad/st). find the power transmitted by the wave
Laser cooling is a modern technique to cool atoms to extremely low temperature. The key point is to tune the laser frequency slightly lower than the nominal frequency of an electronic transition in the atom.
The lowest outdoor temperature ever recorded on Earth was %u2212128.6 %u25E6F, recorded at Vostok Station, Antarctica, in 1983. What is this temperature on the Kelvin scale
An ideal gas expands at a constant total pressure of 2.5 atm from 3.45 L to 6.70 L. calculate the total heat flow into the gas
During an adiabatic process, the temperature of 3.62mol of a monatomic ideal gas drops from 460C to 215C , Find the change in its internal energy
How much work is done by the motor when the position of the arm is moved from x = 0.200 m to x = 0.750 m? If the work is done in 4.50 s, what is the power of the motor in W
question magnesium metal reacts with hydrochloric acid to form aqueous magnesium chloride and hydrogen gas. an excess
question1a 115kg mail bag hangs by a vertical rope 4.0 long. a postal worker then displaces bag to a position 2.2m
As a bat flies toward a wall at a speed of5.70m/s , What frequency does the bat hear in the reflected wave
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