How rapidly a planet loses its atmosphere depends on the planet's I. escape velocity (determined by mass and radius). II. atmospheric composition. III. temperature. IV. rotation period
a. I & II
b. III & IV
c. I, II, & III
d. II, III, & IV
e. I, II, III, & IV
c
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Silicon single crystals are grown using the _________technique.
Fill in the blank(s) with the appropriate word(s).
Vision Problems: A little known fact is that both Robinson Crusoe and Friday wore eyeglasses. As it so happens, Robinson Crusoe was farsighted while Friday was nearsighted. Whose eyeglasses did they use whenever they wanted to start a fire by focusing the sun's rays?
A. Robinson Crusoe's B. Friday's C. Both would work equally well. D. Both actually worked, but Friday's was a little bit better. E. Neither's worked, but fortunately they were in possession of matches.
Suppose that we have two containers, one holding N molecules of helium gas, and one holding N/2 molecules of oxygen gas. Both are initially at room temperature. We then add the same amount of energy to each gas. Which is hotter at the end?
A. The helium B. The oxygen C. Both have about the same temperature. D. One cannot say without measuring.
To determine the thermal conductivity of a structural material, a large 15 cm-thick slab of the material was subjected to a uniform heat flux of 2500 W/m2 , while thermocouples embedded in the wall 2.5 cm. intervals are read over a period of time. After the system had reached equilibrium, an operator recorded the thermocouple readings shown below for two different environmental conditions
From these data, determine an approximate expression for the thermal conductivity as a
function of temperature between 40 and 208°C.
GIVEN
Thermal conductivity test on a large, 6-in.-thick slab
Thermocouples are embedded in the wall 2 in. apart
Heat flux (q/A) = 2500 W/m2
Two equilibrium conditions were recorded (shown above)
FIND
An approximate expression for thermal conductivity as a function of temperature between 40 and
2080C
ASSUMPTIONS
One dimensional conduction
SKETCH
