What are the properties of the Sun that any theory of the origin of the solar system must explain?
What will be an ideal response?
The Sun contains most of the mass of the solar system. It also has a slow rotation. Its age is consistent with the age of the solar system. The solar equator corresponds to the ecliptic.
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What is a void?
A. a part of the sky that astronomers cannot observe due to bright emission from interstellar dust B. another name for a dark nebula C. a part of the sky where no galaxies are visible to us because of obscuring dust in the milky way D. a region in the universe where there are almost no galaxies
A 2.0 g bead slides along a frictionless wire, as shown in the figure. At point A, the bead is moving to the right but with negligible speed
(a) What is the potential energy of the bead at point A? (b) What is the kinetic energy of the bead at point B? (c) What is the speed of the bead at point B? (d) What is the speed of the bead at point C? What will be an ideal response?
The stars in our sky twinkle in brightness and color because of
A) turbulence in the Earth's atmosphere. B) rapid changes in the brightnesses and colors of stars caused by changes in their spectra. C) light pollution. D) the bubbling and boiling of gases on the surfaces of stars.
Roughly how many different chemical compounds are there?
A) 20 B) 100 C) 4 D) 500 E) many more than 500