What part of the eye creates the most refraction as light passes through it?
A. Cornea
B. Aqueous humor
C. Iris
D. Lens
Answer: A. Cornea
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Stars X and Y both have the same apparent brightness, but star X is 10,000 times as luminous as star Y. How much farther away is star X than star Y?
A) Star X is 10 times as far away as star Y. B) Star X is 100 times as far away as star Y. C) Star X is 10,000 times as far away as star Y. D) Star X is 10 times closer to us than star Y.
How would we view time (clocks) on the spaceship as it goes by?
A) Time is the same for everyone. B) Their clocks are going at the same rate as ours. C) Their clocks are going exactly half as fast as ours. D) Their clocks are going faster than ours. E) Their clocks are going slower than ours.
Our earliest atmosphere, formed by outgassing, was much poorer in ________ than now
A) carbon dioxide B) hydrogen C) oxygen D) methane E) nitrogen
Determine the rate of heat transfer per unit length from a 5-cm-OD pipe at 150°C placed eccentrically within a larger cylinder of 85% Magnesia wool as shown in the sketch. The outside diameter of the larger cylinder is 15 cm and the surface temperature is 50°C.
GIVEN
A pipe placed eccentrically within a larger cylinder of 85% Magnesia wool as shown in the sketch
Outside diameter of the pipe (Dp) = 5 cm = 0.05 m
Temperature of the pipe (Ts) = 150°C
Outside diameter of the larger cylinder (Do) = 15 cm = 0.15 m
Temperature of outer pipe (To) = 50°C
FIND
The rate of heat transfer per meter length (q)
ASSUMPTIONS
Two dimensional heat flow (no end effects)
The system is in steady state
Uniform thermal conductivity
SKETCH
