The Oort Cloud is believed to be
A) a grouping of asteroids and meteoroids between the orbits of Mars and Jupiter.
B) the great nebula found just below the belt stars of Orion.
C) a spherical cloud of cometary nuclei far beyond the Kuiper Belt.
D) a flattened belt of cometary nuclei just beyond the orbit of Neptune.
E) the circular disk of gas around the Sun's equator from which the planets formed.
C
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The pin at A in Problem 3.7 is removed and the pole rests on a rough surface at A in the position shown in the figure below. The minimum coefficient of friction at A required for equilibrium is:
(A) 0.41
(B) 0.25
(C) 0.37
(D) 0.64
In the chemical formula for water, H2O, what does the "2" mean?
a. There are two oxygen (O) atoms in a molecule of water. b. There are two hydrogen (H) atoms in a molecule of water. c. The hydrogen in water is actually deuterium. d. none of the above
What is the Roche limit?
A. the distance astronomers can see into a planet's clouds B. the greatest distance from a planet that its satellites can orbit without falling into the Sun C. the mass a planet must exceed to have satellites D. the distance at which a moon held together by gravity may be broken apart by the planet's gravitational attraction
Food is cooked faster in a pressure cooker due to its
A) greater rate of bubble formation in the water. B) higher thermal energy. C) higher temperature. D) none of the above