Three point charges, q1, q2, and q3, are arranged so the potential energy for the pair q1 and q2 is 0.12 J and for the pair q2 and q3 is 0.23 J. If the total potential energy of the arrangement is 0.60 J, what is the potential energy of the pair q1 and q3?
A. 0.11 J
B. 0.35 J
C. 0.25 J
D. 0.95 J
E. Insufficient information is given for a unique answer
C. 0.25 J
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Resistivity and Temperature: Over ordinary temperature ranges, the resistance of most metals such as copper
A. is independent of the temperature of the metal. B. decreases as the metal gets hotter. C. increases as the metal gets hotter. D. is a maximum at 20°C.
The atoms that make up a newborn baby were made
1) in the mother's womb, 2) from the food that the mother ate, 3) in the ancient stars, While all atoms heavier than copper were manufactured by processes 4) photosynthesis. 5) atomic fabrication. 6) supernova explosions. 7) radioactivity. 8) none of these.
From Kepler's third law, a hypothetical planet that is twice as far from the Sun as Earth should have a period of _________________.
Fill in the blank(s) with the appropriate word(s).
The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 4, when its life track moves straight down to join the main sequence?
A) Its surface temperature and luminosity increase. B) Its surface temperature increases, and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases, and its luminosity increases. E) Its surface temperature and luminosity remain the same.