Lava can be
A) extruded from a volcano.
B) a cooled, solid rock.
C) intruded as a dike.
D) both A and B.
Answer: D
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The thermal conductivity of copper is 397 J/s/m/°C and of silver is 427 J/s/m/°C. A rod of each material is used as a heat conductor. If the rods have the same geometry and are used between the same temperature differences for the same time interval, what is the ratio of the heat transferred by copper to the heat transferred by the silver?
a. 0.930 b. 1.395 c. 2.093 d. 0.465 e. 0.791
A substance of unknown composition is heated in an open container. As a result, the mass of the container and its contents
a. decreases. b. remains the same. c. increases. d. Any of these could occur.
A person has his nearsightedness corrected by lenses of -5.00 D. Without his glasses, his near point was 12.5 cm. With his glasses on, what is his near point? Assume the lenses are very close to eyes.
A. 13.0 cm B. 20.0 cm C. 33.0 cm D. 17.5 cm E. 7.50 cm
The color of a yellow banana is a result of blackbody emission.
Answer the following statement true (T) or false (F)