There are no aurora on Venus because it
A) lacks atmospheric oxygen.
B) is too hot.
C) lacks a strong magnetic field.
D) lacks an ionosphere.
E) lacks strong winds.
C
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The average Reynolds number for air passing in turbulent flow over a 2-m-long flat plate is 2.4 x 106. Under these conditions, the average Nusselt number was found to be equal to 4150. Determine the average heat transfer coefficient for an oil having thermal properties similar to those in Appendix 2, Table 18 at 30°C at the same Reynolds number and flowing over the same plate.
GIVEN
Turbulent flow of air over a flat plate
Average Reynolds number (ReL) = 2.4 x 106
Plate length (L) = 2 m
Average Nusselt number (Nu) = 4150
FIND
Average heat transfer coefficient
ASSUMPTIONS
Steady state
Fully developed turbulent flow
Transition from laminar to turbulent flow occurs at Rex = 5 x 105
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 18, for oil at 30°C
Thermal Conductivity (k) = 0.11 W/(m K)
Kinematic Viscosity (v) = 15.4 ? 10–6 m2/s
Thermal Diffusivity (a) = 707 ? 10–10 m2/s
The vast majority of stars in a newly formed star cluster are
A) less massive than the Sun. B) very high-mass, type O and B stars. C) red giants. D) about the same mass as our Sun.
According to the authors of the text, which of the following best describes how our common sense relates to the theory of relativity?
A) Relativity does not violate our common sense because we do not have common sense about motion near the speed of light. B) Relativity violates common sense because it contradicts logic. C) Relativity violates common sense because it is counterintuitive. D) Relativity violates common sense because the theory contradicts itself in many cases. E) Relativity violates common sense because it is full of paradoxes.
Place the three phases of water in order of increasing force of interaction between molecules:
A) ice, water, vapor B) vapor, ice, water C) water, ice, vapor D) vapor, water, ice