In our solar system, Jovian planets are
A) large, made mostly of gases and liquids with low densities, and found far from the Sun
B) small, made of pure rock with high densities, and found close to the Sun
C) large, made of pure gases with low densities, and found far from the Sun
D) small, made mostly of rock and iron with high densities, and found close to the Sun
A
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Which of the following best explains the origin of primitive meteorites?
A) They are leftover chunks of rock from the earliest period in the formation of the solar system. B) They are fragments of comets rather than of asteroids. C) They are fragments of an asteroid that was shattered by a collision. D) They are fragments of rock chipped off the planet Mercury. E) They are fragments of rock chipped off the planet Mars.
Heat radiation relates mainly to
A) infrared radiant energy. B) radiation not visible to humans. C) waves you absorb when near a hot stove. D) all of the above E) none of the above
A pressure of 3.00 × 10^?7 mm of Hg is achieved in a vacuum system. How many gas molecules are present per liter volume if the temperature is 298 K? (760 mm of Hg = 1 atm, R = 0.082 1 L/atm/mol/K, and NA = 6.02 × 10^23)
a. 6.5E+10 b. 8.6E+16 c. 9.7E+12 d. 1.8E+9 e. 5.7E+14
Uniform Electric Fields: A space probe approaches a planet, taking measurements as it goes. If it detects a potential difference of 6000 MV between the altitudes of 253,000 km and 276,000 km above the planet's surface, what is the approximate electric field strength produced by the planet at 264,500 km above the surface? Assume the electric field strength is approximately constant at these altitudes.
A. 261 N/C B. 0.261 N/C C. 561 N/C D. 493 ?N/C