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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Twenty milliseconds is
a. 0.00002 s b. 0.0002 s c. 0.002 s d. 0.02 s e. 20000 s
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
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
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.