An electron in a hydrogen atom has orbital quantum number l = 4. How many possible values of the magnetic quantum number ml could it have?
A) 4 B) 9 C) 10 D) 3 E) 5
B
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For a 10 mol mixture of air (8 mols nitrogen, N2, and 2 mols oxygen, O2) at 101 kPa, 20ºC, determine the mass concentration and the molar concentration of N2 and O2.
What will be an ideal response?
A shell-and-tube heat exchanger with two tube passes and a single shell pass is used to heat water by condensing steam in the shell. The flow rate of the water is 15 kg/s and it is heated from 60 to 80°C. The steam condenses at 140°C and the overall heat transfer coefficient of the heat exchanger is 820 W/(m2 K). If there are 45 tubes with an OD of 2.75 cm, calculate the length of tubes required.
GIVEN
• Shell-and-tube heat exchanger with two tube passes and one shell pass
• Water in tubes, condensing steam in shell
• Water flow rate m w= 15 kg/s
• Water temperatures
? Tw,in = 60°C
? Tw,out = 80°C
• Steam temperature (Ts) = 140°C
• Overall heat transfer coefficient (U) = 820 W/(m2 K)
• Number of tubes (N) = 45
• Tube outside diameter (D) = 2.75 cm = 0.0275 m
FIND
• The length of tubes (L)
ASSUMPTIONS
• Counterflow
SKETCH
PROPERTIES AND CONSTANTS
the specific heat of water at the mean temperature of 70°C (cpw)= 4188 J/(kg K)
Two nuclei have the same number of protons but different numbers of neutrons. We call these two nuclei
A. ions. B. atomic mass units. C. isotopes. D. isobars.
A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m. The ball makes 2.0 revolutions every 1.0 s
(a) What are the magnitude and direction of the acceleration of the ball? (b) Find the tension force that the string exerts on the ball.