The Earth's temperature increases with depth. Pressure also increases with depth from the weight of the rock above. As pressure increases the
A) rock above begins to melt.
B) melting point of the rock (at depth) decreases.
C) melting point of the rock (at depth) also increases.
D) temperature increases, rocks begin to melt.
Answer: C
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Derive an expression for the temperature distribution in an infinitely long rod of uniform cross section within which there is uniform heat generation at the rate of 1 W/m. Assume that the rod is attached to a surface at Ts and is exposed through a convective heat transfer coefficient h to a fluid at Tf.
GIVEN
• An infinitely long rod with internal heat generation
• Temperature at one end = Ts
• Heat generation rate ( q
GA) = 1 W/m
• Convective heat transfer coefficient = hc
• Ambient fluid temperature = Tf
FIND
• Expression for the temperature distribution
ASSUMPTIONS
• The rod is in steady state
• The thermal conductivity (k) is constant
SKETCH
The type of element is determined by the number of ____
a. protons in the atom b. neutrons in the atom c. electrons in the atom d. electrons that have been removed from the atom e. protons that have been removed from the atom
There was a very rapid expansion period called inflation early in the history of the universe. When was this?
A: 10^43 to 10^42 seconds B: 10^35 to 10^33 seconds C: 10^12 to 10^11 seconds D: 1^3 seconds E: 100^200 seconds
Two uniformly charged rods are positioned horizontally as shown. The top rod is positively charged and the bottom rod is negatively charged. The total electric field at the origin:
1.is zero.
2.has both a non-zero x component and a non-zero y component.
3.points totally in the +x direction.
4.points totally in the –x direction.
5.points totally in the +y direction
6.points totally in the –y direction.
7.points in a direction impossible to determine without doing a lot of math.