What do astronomers believe asteroids are remnants of and why?
What will be an ideal response?
Astronomers have evidence that the asteroids are the remains of material lying 2 to 4 AU from the Sun that was unable to form a planet because of the gravitational influence of Jupiter, the next planet outward
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Which of the following is not true of quasars?
A) Quasars were more common in the past. B) The light produced by quasars comes from an accretion disk surrounding a supermassive black hole. C) Quasars are powered by the intense production of large numbers of stars that can only be sustained for a relatively short time. D) Some quasars can change their brightness on the timescale of hours. E) Some quasars are more than a thousand times more luminous than the Milky Way.
An electric field is set up between two parallel plates, each of area 2.0 m2, by putting 1.0 ?C of charge on one plate and -1.0 ?C of charge on the other
The plates are separated by 4.0 mm with their centers opposite each other, and the charges are distributed uniformly over the surface of the plates. What is the magnitude of the electric field between the plates at a distance of 1.0 mm from the positive plate, but not near the edges of the plates? (?0 = 8.85 × 10-12 C2/N • m2) A) 4.2 × 104 N/C B) 1.4 × 104 N/C C) 3.1 × 104 N/C D) 0.00 N/C E) 5.6 × 104 N/C
According to models of planetary interiors, the differences in mass among the four jovian planets (Jupiter, Saturn, Uranus, and Neptune) are due primarily to differences
A) in the amounts of material in the layers extending from the tops of their cores to their surfaces. B) in their core masses. C) in composition. D) in density.
A possible means of spaceflight is to place a perfectly reflecting aluminized sheet into Earth orbit and use the light from the Sun to push this solar sail. If a huge sail of area 6.00 × 105 m2 and mass 6000 kg were placed into orbit and turned toward the Sun, what would be the force exerted on the sail? (Assume a solar intensity of 1380 W/m2.)
What will be an ideal response?