Consider two copper wires with circular cross-sections and equal lengths. One wire has 3 times the diameter of the other. How do the resistances of these two wires compare?
A) The thicker wire has 1/3 the resistance of the thinner wire.
B) The thicker wire has 1/9 the resistance of the thinner wire.
C) The thicker wire has 3 times the resistance of the thinner wire.
D) The thicker wire has 9 times the resistance of the thinner wire.
E) The thicker wire has times the resistance of the thinner wire.
B
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A rectangular oven 1 m by 1 m by 1 m is heated from the bottom surface at 200ºC. If the top surface is 80ºC at a given time and the sides are assumed to be well insulated, determine the heat transfer through the oven.
What will be an ideal response?
Go to the screen "Key Evidence of Water," and and select the feature called "Recurring Slope Lineae." Study this feature at each of the four zoom levels offered, and be sure to view the animation called "recurring slope linaea (gif)" that you will see at the third zoom level. Which of the following statements are true?
A. The recurring slope lineae are found among impact craters. B. The recurring slope lineae look like narrow dark streaks. C. The recurring slope lineae are found on flat ground. D. The recurring slope lineae appear to grow in spring and summer. E. The recurring slope lineae appear to be volcanic in origin.
Based on observations, which of the following statements about stars in the Milky Way is generally true?
A) The older the star, the lower its abundance of heavy elements. B) The younger the star, the higher its mass. C) The older the star, the faster its orbital speed. D) The less massive the star, the older it is. E) The older the star, the bluer its color.
Light of wavelength 633 nm from a He-Ne laser passes through a circular aperture and is observed on a screen 4.0 m behind the aperture. The diameter of the central bright area is 5.4 cm. What is the diameter of the aperture?
A) 2.0 ?m B) 960 ?m C) 110 ?m D) 6600 ?m