LHC stands for
A. Lorentz Heavy Centrifuge.
B. Level Height Charges.
C. Laser Hertz Catalyzer.
D. Large Hadron Collider.
E. None of these choices are correct.
D. Large Hadron Collider.
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Some people say that, based on the arrangement of its molecules, glass should be considered a liquid. If we think of glass as a liquid, in which of these properties is it most unlike other common liquids?
A. Transparency B. Viscosity C. Density D. Weight
In one-dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object has which of the following properties?
a. It is positive. b. It is negative. c. It is zero. d. It can be positive, negative, or zero.
We are led to believe that there were two kinds of charge because we are able to
(A) isolate them in separate containers. (B) see two effects, attraction and repulsion. (C) detect different weights for the same object. (D) separate electrons and protons.
Atmospheric pressure air is heated in a long annulus (25-cm-ID, 38-cm-OD) by steam condensing at 149°C on the inner surface. If the velocity of the air is 6 m/s and its bulk temperature is 38°C, calculate the heat transfer coefficient.
GIVEN
Atmospheric flow through an annulus with steam condensing in inner tube
Inside diameter (Di) = 25 cm = 0.25 m
Outside diameter (Do) = 38 cm = 0.38 m
Steam temperature (Ts) = 149°C
Air velocity (V) = 6 m/s
Air bulk temperature (Tb) = 38°C
FIND
The heat transfer coefficient (hc)
ASSUMPTIONS
Steady state
Steam temperature is constant and uniform
Heat transfer to the outer surface is negligible
Air temperature given is the average air temperature
Thermal resistance of inner tube wall and condensing steam is negligible (Inner tube wall surface
temperature = Ts)
SKETCH
PROPERTIES AND CONSTANTS
for dry air at 38°C
