Rank the following events in the order that corresponds to the formation of a planetary system.
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Earliest
Gravity collapses a cloud of interstellar gas.
A rotating disk forms and dust grains stick together by static electricity.
Small bodies collide to form larger bodies.
Primary atmospheres form.
A stellar wind "turns on" and sweeps away gas and dust, removing primary atmospheres from planets.
Secondary atmospheres form.
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In the hypothetical atomic interaction shown in figure C9.13, assume that initially the atoms have a total energy of 3 × 10-21 J at r = 0.1 nm. These atoms are
A. Unbound (they will separate to infinity).
B. Bound (they will not separate to infinity).
C. The answer depends on whether the atoms are initially moving toward or away from each other.
A photosensitive surface is illuminated with both blue and violet light. The light that causes the greater number of ejected electrons is
A) blue light. B) violet light. C) both eject equal numbers. D) need more information
Which is the correct description of the Sun's location within the Milky Way?
A) in the disc but at its outer edge B) as Herschel found, very close to the Galactic center C) in the disc and about one-half a galactic radius from the center D) above the disc and about one-third of the galactic radius from the center E) at the outer edge of the galactic bulge but in the plane of the disc
A force F is exerted on an object of mass m through a distance d. A force twice as large (2F) is exerted on a mass 2m also through the distance d. Explain the relation between the amount of work done in the two cases
What will be an ideal response?