An alternative statement of the uncertainly principle tells us that we cannot know precisely both
A) a particle's energy and the time during which it has this energy.
B) a particle's mass and energy.
C) whether a particle is a wave or whether it is truly a particle.
D) a particle's momentum and its energy.
A) a particle's energy and the time during which it has this energy.
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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)
What power lens is needed to correct for nearsightedness where the uncorrected far point is 75 cm?
A) -1.33 D B) +1.33 D C) -0.75 D D) +0.75 D E) -1.00 D
The number of vibrations per second of an electromagnetic wave is referred to as its
A) energy B) frequency C) speed D) wavelength
The purpose of prescription glasses for a near-sighted person is to bring the apparent positions of distant objects
A. to the far point of the eye. B. to the near point of the eye. C. to the retina of the eye. D. none of the above.