For the first excited state (n=2) of the particle in a box of width L, what is the uncertainty in momentum?
a. 
b. 
c. 
d. 
d.
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The "back emf" of a motor refers to a source of voltage that
a. occurs when the motor runs backwards. b. occurs when the motor is used as a generator. c. is biggest when the current through the motor is biggest. d. is biggest when the motor turns fastest.
Series/Parallel Circuits: Three resistors of resistances 4.0 ?, 6.0 ?, and 10 ? are connected in parallel. If this combination is now connected in series with an ideal 12-V battery and a 2.0-? resistor, what is the current through the 10-? resistor?
A. 0.59 A B. 2.7 A C. 11 A D. 16 A
What do all four ring systems have in common?
What will be an ideal response?
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
