An object more massive than the Sun, but roughly the size of a city, is a:
A) supernova remnant.
B) white dwarf.
C) brown dwarf.
D) neutron star.
E) red dwarf.
D
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Describe the Ptolemaic model of the solar system. How did Ptolemy account for the apparent retrograde motion of the planets?
What will be an ideal response?
A horizontal disk with moment of inertia I1 rotates with angular speed ?1 about a vertical frictionless axle. A second horizontal disk, with moment of inertia I2 drops onto the first, initially not rotating but sharing the same axis as the first disk. Because their surfaces are rough, the two disks eventually reach the same angular speed ?. The ratio ?/?1 is equal to
1. I1 / I2 2. I2 / I1 3. I1 / (I1 + I2) 4. I2 / (I1 + I2)
The tail of a comet always points ________.
A. toward the Sun B. away from the Sun C. backward D. forward
Which of the following could be the molecular formula for an alkene?
a. C8H8 b. C9H18 c. C5H9 d. C5H8 e. C8H18