A metal bar is used to conduct heat. When the temperature at one end is 100°C and at the other is 20°C, heat is transferred at a rate of 16 J/s. If the temperature of the hotter end is reduced to 60°C, what will be the rate of heat transfer?
a. 4 J/s
c. 9 J/s
b. 8 J/s
d. 12 J/s
B
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The resistance of the light bulb in ohms is
a. 0.05 c. 720 b. 20 d. none of the above
Why are relatively few details known about the life that existed on Earth prior to a few hundred million years ago?
A) Nearly all life at that time was microscopic, making it much more difficult to identify. B) Many rocks have been transformed by high heat and pressure, destroying any fossils they contained. C) Older rocks are more rare than younger rocks because of geologic processes like subduction. D) All of the above
What is the formula of a compound formed from the ions M1+ and X3-?
a. M3X b. MX3 c. MX d. None of these
A polished aluminum plate 0.3 cm thick is used to partially shield against thermal radiation. Determine the shape factor between one side of the plate and the opposite side, if there are 1.2 cm diameter holes punched in the plate as shown in the figure.
