Your vision is sharpest when your pupil is
A) dilated.
B) constricted.
C) same either way
Answer: B
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Steam at 1 atm and 100°C is flowing across a 5-cm-OD tube at a velocity of 6 m/s. Estimate the Nusselt number, the heat transfer coefficient, and the rate of heat transfer per meter length of pipe if the pipe is at 200°C.
GIVEN
• Steam flowing across a tube
• Steam pressure = 1 atm
• Steam bulk temperature (Tb) = 100°C
• Tube outside diameter (D) = 5 cm = 0.05 m
• Steam velocity (V) = 6 m/s
• Pipe surface temperature (Ts) 200°C
FIND
(a) The Nusselt number Nu D (b) The heat transfer coefficient h c(c) The rate of heat transfer per unit length (q/L)
ASSUMPTIONS
• Steady state
SKETCH
PROPERTIES AND CONSTANTS
Thermal conductivity (k) = 0.0249 W/(m K) Kinematic viscosity (?) = 20.2 × 10–6 m2/s Prandtl number (Pr) = 0.987 At the tube surface temperature of 200°C, the Prandtl number of the steam (Prs) = 1.00
Constant Acceleration Kinematics: An object starts from rest and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third second?
A. 5.0 m B. 15 m C. 25 m D. 45 m
The rms velocity of a He molecule in helium gas with a temperature of 20
is 1,352 m/s. What is the rms velocity of the molecule if the temperature of the gas is tripled?
A. 2,340 m/s B. 3,640 m/s C. 3,980 m/s D. 4,120 m/s E. 4,500 m/s
What are the smaller parts of a proton?
A.) Two down quarks and an up quark. B.) Two electrons and a neutron. C.) A strange quark, a down quark, and a charm quark. D.) An up quark and a down quark. E.) Two up quarks and a down quark.