Lucite has an index of refraction of 1.50. What is its critical angle if it is in air?
A) 1.16°
B) 15°
C) 41.8°
D) 65.2°
E) 87.4°
C
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A plane wall 15 cm thick has a thermal conductivity given by the relation k = 2.0 + 0.0005 T W/(m K) where T is in degrees Kelvin. If one surface of this wall is maintained at 150 °C and the other at 50 °C, determine the rate of heat transfer per square meter. Sketch the temperature distribution through the wall.
GIVEN
A plane wall
Thickness (L) = 15 cm = 0.15 m
Thermal conductivity (k) = 2.0 + 0.0005 T W/(m K) (with T in Kelvin)
Surface temperatures: Th = 150 °C Tc = 50 °C
FIND
(a) The rate of heat transfer per square meter (q/A)
(b) The temperature distribution through the wall
ASSUMPTIONS
The wall has reached steady state
Conduction occurs in one dimension
SKETCH
Which of the following is not a type of polarization?
(a) Electron current flow (b) Electronic (c) Ionic (d) Orientational
Mass added to a pulsar from its companion can speed it up into a(n) ________ pulsar
Fill in the blank(s) with correct word
At the Sun Dagger in New Mexico, a dagger-shaped beam of sunlight pierces a spiral
A) every day at noon. B) at noon on the summer solstice. C) at sunset on the spring equinox. D) at noon on the day of full Moon each month. E) during the totality of a total solar eclipse.