On the H-R diagram, red supergiants like Betelgeuse lie
A) at the bottom left.
B) at the top left.
C) at the top right.
D) at the bottom right.
E) They can't be plotted, for they are not main sequence.
C
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The example shown is a(n) ______ website structure.
A. linear/tutorial B. hierarchical C. webbed D. random
Which of the following is a type of fast mass
wasting? a) glacier flow b) creep c) meanders d) mudslides
The Milky Way galaxy has collided with several other large galaxies in its lifetime
a. True b. False Indicate whether the statement is true or false
Suppose that a pipe carrying a hot fluid with an external temperature of Ti and outer radius ri is to be insulated with an insulation material of thermal conductivity k and outer radius ro. Show that if the convective heat transfer coefficient on the outside of the insulation is h and the environmental temperature is T?, the addition of insulation can actually increases the rate of heat loss if ro < k /h and that maximum heat loss occurs when ro = k/h . This radius, rc, is often called the critical radius.
GIVEN
An insulated pipe External temperature of the pipe = Ti Outer radius of the pipe = ri Outer radius of insulation = ro Thermal conductivity = k Ambient temperature = T? Convective heat transfer coefficient = h
FIND
Show that (a) The insulation can increase the heat loss if ro < k/h (b) Maximum heat loss occurs when ro = k/h
ASSUMPTIONS
The system has reached steady state The thermal conductivity does not vary appreciably with temperature Conduction occurs in the radial direction only
SKETCH
