Why do astronomers believe Triton may have been a planet that was captured by Neptune?
A) It orbits Neptune in the opposite direction of Neptune's rotation.
B) It is too large to have been formed in the jovian nebula that formed Neptune.
C) It has an atmosphere and a measurable greenhouse effect.
D) It undergoes seasonal changes.
E) It is colder than any other moon or planet.
A
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Energy and Mass: One of the first atomic bombs released energy equivalent to that of 20,000 tons of TNT explosive. How much mass was converted to energy by this explosion, given that 1000 tons of TNT produce 4.3 × 1012 J of energy. Incidentally, modern H-bombs have energy yields 1000 times as much! (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
The Earth's escape velocity is defined to be the
A) minimum orbital speed for the Moon to escape from the Earth's gravity B) minimum orbital speed for the Earth to escape from the Sun's gravity C) minimum velocity required for an object to escape the Earth's gravity D) velocity that objects are pulled toward the Earth's surface by gravity
When a current is induced by a changing magnetic field B1, the current always produces a second magnetic field B2 such that
A. B1 and B2 completely cancel each other out. B. B1 and B2 combine to give a weaker magnetic field than B1 alone. C. B1 and B2 combine to give a stronger magnetic field than B1 alone. D. It is not possible to tell whether the combined field is stronger or weaker than B1 without knowing how B1 is changing
The "flatness" problem arises because the curvature of space seems remarkably close to
A) zero curvature, favoring a spherical cosmos. B) exactly one. C) .5, suggesting we are split between open and closed universes. D) 2.73 K, in spite of the eddies and turbulence that led to galaxy formation. E) infinity, suggesting an open universe is the only possible cosmology.