Which of these was NOT seen telescopically by Galileo?
A) sunspots
B) Venus' phase cycle
C) stellar parallax
D) four moons around Jupiter
E) craters and mare on the Moon
C
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How long will it take a charged 80-mF capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45-W resistor?
a. 0.92 ms b. 0.64 ms c. 0.40 ms d. 0.19 ms e. 0.80 ms
What is the main consequence of forming jovian planets starting with extra mass from hydrogen compounds?
a. They captured more gas from interstellar space. b. They captured gas from the solar wind. c. They captured more mass from heavy bombardment. d. Their gravity became strong enough to attract hydrogen and helium gas from the solar nebula.
Super-Earths are:
A) planets that are most earthlike, likely to harbor life. B) planets that are a few times the mass of the Earth. C) planets that have earthlike masses, but orbit much closer to their star than the Earth does to the Sun. D) any rocky (or terrestrial) planet. E) Earth-mass planets that are much lower in density than the Earth, giving them larger radii.
Optical density is directly proportional to
A) mass density. B) light speed. C) index of refraction. D) index of reflection.