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Consider a vertical, single-pane window of equivalent width and height (W = L = 1 m). The interior surface is exposed to the air and walls of a room, which are each at 18°C. Under cold ambient conditions for which a thin layer of frost has formed on the inner surface, what is the heat loss through the window? How would your analysis be affected by a frost layer whose thickness is not negligible? During incipience of frost formation, where would you expect the frost to begin to develop on the window? The frost may be assumed to have an emissivity of ε = 0.90.
a ball of diameter 0.05 m and specific gravity 0.5 is dropped from a height of 1 m into a large pool of water.
a laser is directed at a double-slit arrangement. if we increase the wavelength of the light which of the following
a sphere of diameter 100 mm rotating at a rate of 286 rpm is situated in a stream of water 15 degree c that has a
air flows in a round pipe at a rate of 0.015 lbmsec. the air enters the pipe at a temperature 76.8 of and a pressure
At what equivalence ratio for octane-air mixtures does the carbon to oxygen ratio of the system equal one? Why is this of interest?
a pump is located 4.5 m to one side of and 3.5 m above a reservoir. the pump is designed for a flow rate of 6 ls. for
consider airflow past a sphere of diameter 5 cm. the incoming air velocity is 100 ms. the air density and temperature
a certain object weighs 300 n at the earths surface. determine the mass of the object in kilograms and its weight in
a water clock clepsydra used in ancient greece is designed as a vessel with a small orific o. the time is determined
A geothermal pump is used to pump brine whose density is 1050 kg/m3 at a rate of 0.3 m3/s from a depth of 200 m, For a pump efficiency of 74 percent, determine the required power input to the pump.
Energy in the home, personal energy use and home energy efficiency. Efficient use of ‘waste' heat and renewable heat sources.
a 5.70kg block hangs from a spring with spring constant 1900nm . the block is pulled down 6.80 cm from the equilibrium
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