If the principal quantum number for hydrogen is 4, which one of the following is not a permitted orbital magnetic quantum number for that atom?
a. -2
c. 3
b. 0
d. 5
D
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A 10-A current flows through a wire for 2.0 min. (e = 1.60 × 10-19 C) (a) How much charge has passed through this wire? (b) How many electrons have passed any point in the wire?
What will be an ideal response?
Which two geological processes appear to have been most important in shaping the present surface of Venus?
A) impacts and volcanoes B) impacts and tectonics C) tectonics and erosion D) volcanoes and tectonics E) volcanoes and erosion
Hot water is used to heat air in a double pipe heat exchanger as shown in the following sketch. If the heat transfer coefficients on the water side and on the air side are 550 W/(m2K) and 55 W/(m2 K), respectively, calculate the overall heat transfer coefficient based on the outer diameter. The heat exchanger pipe is 5 cm, schedule 40 steel (k = 54 W/m K), with water inside.
GIVEN
• A double pipe heat exchanger with water in inner tube and air in the annulus
• Heat transfer coefficients
? Water side ih = 550 W/(m2 K)
? Air side oh = 55 W/(m2 K)
• Inner pipe: 5 cm, schedule 40 steel
• Pipe thermal conductivity (k) = 54 W/(m K)
FIND
• The overall heat transfer coefficient based on the outer diameter (Uo). ASSUMPTIONS
• Uniform heat transfer coefficients
SKETCH
PROPERTIES AND CONSTANTS
for 5 cm, schedule 40 pipe
? Outside diameter (Do) = 2.375 in = 6.033 cm=0.0603 m
? Wall thickness (t) = 0.154 in=0.39 cm=0.0039 m
Which interacts more with sounds of relatively high frequencies?
A) large bells B) small bells C) both the same