Movement of the lithosphere
A) has a plastic-like flow.
B) causes earthquakes and volcanic activity.
C) has a leisurely pace and allows the formation of gentle rolling hills.
D) is intermittent.
Answer: B
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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
A quantity that is a measure of how the velocity of a body changes with time is
A. distance. B. acceleration. C. time. D. speed.
What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a flat black surface?
a. 2.25 × 10^?5 Pa b. 0.06 Pa c. 7 × 10^?4 Pa d. 4.5 × 10^?6 Pa e. 9.0 × 10^?6 Pa
Twenty milliseconds is
a. 0.00002 s b. 0.0002 s c. 0.002 s d. 0.02 s e. 20000 s