Mercury has a density of 13,600 
The column of mercury that would produce a pressure of 
is
A. 32.120 in.
B. 29.920 in.
C. 25.430 in.
D. 19.800 in.
E. 9.8000 in.
B. 29.920 in.
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When I was a teenager, I saw a Candid Camera sequence in which they filmed a person struggling with a suitcase that (unknown to that person) contained a large and rapidly spinning gyroscope. Imagine you are carrying such a suitcase where the gyroscope’s angular velocity is oriented horizontally to your right as you carry it in your right hand. Imagine you try to make a left turn, thus turning the suitcase to the left around a vertical axis. What does the suitcase do?
A. It turns to the left as one would expect. B. It tries to turn instead to the right. C. It tries to rotate around a horizontal axis, with its right face turning upward. D. It tries to rotate around a horizontal axis, with its left face turning upward. E. It tries to rotate around a rightward axis, with its front edge moving up.
Which of the following is true? The number of daylight hours depends on
a. the International Date Line. b. the longitude. c. the latitude. d. all of these.
The number of neutrons in a stable isotope must
A. equal the number of protons. B. equal the number of electrons. C. equal the number of protons plus electrons. D. None of the choices are correct
Saturated steam at 137 kPa condenses on the outside of a 2.6-m-length of copper tubing heating 5 kg/hr of water flowing in the tube. The water temperatures, measured at 10 equally spaced stations along the tube length are
Calculate (a) average overall heat transfer coefficient Uo based on the outside tube area;
(b) average water-side heat transfer coefficient hw (assume steamside coefficient at
hs = 11,000 W/(m2 K)), (c) local overall coefficient Ux based on the outside tube area for
each of the 10 sections between temperature stations, and (d) local waterside coefficients
hwx for each of the 10 sections. Plot all items vs. tube length. Tube dimensions: ID = 2 cm,
OD = 2.5 c. Temperature station 1 is at tube entrance and station 11 is at tube exit.
GIVEN
? Saturated steam condensing on copper tubing with water flowing within
? Steam pressure = 1.35 atm = 136,755 N/m2
? Tube length (L) = 2.6 m
? Water flow rate mw = 5 kg/h = 0.00139 kg/s
? Water temperatures given above as a function of distance along pipe
? Tube diameters
? Di = 2 cm = 0.02 m
? Do = 2.5 cm = 0.025 m
FIND
(a) Average overall heat transfer coefficient based on the outside tube area (Uo)
(b) Average water-side transfer coefficient hw
(c) Local overall coefficient (Ux) for each of the 10 sections
(d) Local water-side coefficient hwx for each of the 10 sections
Plot all items vs. tube length
ASSUMPTIONS
? The steam-side heat transfer coefficient hs = 11,000 W/(m2 K)
? No scaling resistance
? Variation of the specific heat of water is negligible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for saturated steam at 136,755 N/m2: Ts = 107°C
For water at the average temperature of 55°C, the specific heat (cpw) = 4180 J/(kg K)
From Appendix 2, Table 12, the thermal conductivity of copper (k) = 392 W/(m K) at 127°C