What conditions are required for a solar eclipse?
A) The phase of the Moon must be new, and the Moon's orbital plane must lie in the ecliptic.
B) The phase of the Moon can be new or full, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
C) The phase of the Moon must be full, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
D) The phase of the Moon must be full, and the Moon's orbital plane must lie in the ecliptic.
E) The phase of the Moon must be new, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
E
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What does the Greenhouse Effect cause?
A. It shields us from the Sun's ultraviolet rays. B. It protects the surface of Earth from cosmic rays. C. It causes Earth's surface and atmosphere to be warmer than they would be otherwise. D. It is the main source of Earth's oxygen.
The voltage induced in self-inductions is
A) always in a direction opposing the changing voltage that produced it. B) likely higher than the changing voltage that causes it. C) both of these D) neither of these
Two resistors of values 7.0 and 15.0 ? are connected in parallel. This combination in turn is hooked in series with a 3.8-? resistor and a 22.3-V battery. What is the current in the 3.8-? resistor?
a. 21 A b. 2.6 A c. 0.86 A d. 5.9 A e. 190 A
Based on models, how does Jupiter's core compare in size and mass to Earth?
A) It is about the same size and mass as Earth. B) It is about 10 times as large in both size and mass as Earth. C) It is about the same mass, but is 10 times as large in size as Earth. D) It is about the same size, but has about 10 times as much mass as Earth. E) Jupiter doesn't have a core—it is made entirely from hydrogen and helium.