The speed of light in a material is 0.50c. What is the critical angle of a light ray at the interface between the material and a vacuum?
A) 30°
B) 21°
C) 24°
D) 27°
A
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A condenser for a large refrigerator is a four-shell-eight-tube-pass heat exchanger. The condensing fluid is ammonia at 40ºC and the overall heat transfer coefficient is 500 W/m^2?K. 10 kg/s of water at 5ºC, heated to 30ºC, is used to cool the ammonia. Determine the mass flow of ammonia if its heat of vaporization is 1102 kJ/kg and then determine the surface area of the heat exchanger.
What will be an ideal response?
An “empty” steel barrel with its lid off has some gasoline remaining in the bottom, as shown. If the vapor pressure is 1 psia, estimate the evaporation rate of the gasoline and its vapor pressure half-way up in the barrel. Assume the mass diffusivity of gasoline into air is 0.0094 ft^2/s and assume that the vapor pressure of the gasoline is zero at the top.
Being the ideal engine, the maximum COP of a Carnot cycle operated in reverse as a refrigerator is
A) (Th/Tc)(1 – Tc/Th)-1. B) 100. C) (1 – Tc/Th)-1. D) (Tc/Th) ? (1 – Tc/Th)-1.
Our model for explaining the electrical interaction between charged objects
A. makes sense only at very high speeds. B. depends very strongly on the mass of the two objects. C. depends on the existence of three kinds of charge. D. postulates that an electric field surrounds each charged object.