Quarks have electric charges of magnitude
a. e.
b. 1/3 e.
c. 2/3 e.
d. 0.
e. none of the above
b, c
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The structure of polycarbonate is _________. As a result, it is transparent, and this leads to applications such as safety-glass lenses.
Fill in the blank(s) with the appropriate word(s).
Consider a situation where a constant force of 25N acts on an object having a mass of 2 kg for 3 seconds. What is the impulse provided by the force?
a. 150 Ns b. 50 Ns c. 75 Ns d. undetermined—not enough information given e. none of the above
According to the argument in the text, the Moon’s average surface temperature (since it has no atmosphere and is the same distance from the sun as the earth) should also be 255 K, or it would be if all points on its surface had the same temperature (and the Moon has the same average reflectance as the earth). But the Moon rotates very slowly relative to the sun (once a month) and has no atmosphere or ocean to redistribute energy differences. How do you think that these facts might affect the Moon’s average temperature?
A. The average should be less than 255 K. B. The average should be more than 255 K. C. The average should be the same: the energy flowing in must still balance the energy flowing out.
The type of heat transfer that occurs between a heating lamp and the food that it is keeping warm is
A) convective. B) conductive. C) radiative. D) countercurrent. E) evaporation.