The orbital quantum number can have any integer value ranging from
A)
0 to n.
B)
0 to (n - 1).
C)
1 to n.
D)
1 to (n + 1).
E)
1 to (n - 1).
B
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Which of the following statements is true of reflection nebulae?
A) They have a distinctive blue color. B) The gases in reflection nebulae are excited to emit photons. C) The spectrum of a reflection nebula is not the reflected absorption spectrum of starlight. D) They are produced when a hot star excites the gas to produce an emission spectrum.
The equation has been proposed by Hausen for the transition range (2300 < Re < 8000) as well as for higher Reynolds numbers. Compare the values of Nu predicated by Hausen’s equation for Re = 3000 and Re = 20,000 at D/L = 0.1 and 0.01 with those obtained from Gnielinski correlation. Assume the fluid is water at 15°C flowing through a pipe at 100°C.
GIVEN
• Water flowing through a pipe
• The Hausen correlation given above
• Water temperature = 15°C
• Pipe temperature = 100°C
FIND
• The Nusselt number using the Hausen correlation and appropriate equations and charts in the text for Re = 3000 and 20,000 and D/L = 0.1 and 0.01
ASSUMPTIONS
• Steady state
• Constant and uniform pipe temperature
SKETCH
PROPERTIES AND CONSTANTS
for water at 15°C
Absolute viscosity (?b) = 1136 × 10–6 (Ns)/m2
Prandtl number (Pr) = 8.1 At 100°C ?s = 277.5 × 10–6 (Ns)/m2
Prs= 1.75
When you look into a pool of water, the depth looks less than it actually is because the light is dispersed
a. True b. False Indicate whether the statement is true or false
Two hoops or rings (I = MR2) are centered, lying on a turntable. The smaller ring has radius = 0.05 m; the larger has radius = 0.10 m. Both have a mass of 5.0 kg. What is the total moment of inertia as the turntable spins? Ignore the mass of the turntable
a. 7.5E–1 kg·m2 b. 1.1E–1 kg·m2 c. 1.3E–2 kg·m2 d. 6.3E–2 kg·m2 e. 5.0E–2 kg·m2