In terms of axial tilt, which of the jovian planets shows us the largest inclination?
A) Pluto B) Neptune C) Saturn D) Jupiter E) Uranus
E
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The large planetesimals would have grown faster than the smaller planetesimals because
a. they were moving faster in their orbits than the smaller planetesimals. b. their stronger gravity would pull in more material. c. there was more material located near them that could be accreted. d. the smaller planetesimals were covered by a layer of material that was lost during collisions. e. All of the other choices are correct.
A child on a skateboard is moving at a speed of 2 m/s. After a force acts on the child, her speed is 3 m/s. What can you say about the work done by the external force on the child?
a) positive work was done b) negative work was done c) zero work was done
Why do we say that the Doppler technique gives the planet's "minimum mass"?
A) The size of the Doppler shift that we detect depends on whether the planet's orbit is tilted. B) The size of the Doppler shift that we detect depends on knowing the star's mass, which can be very uncertain. C) Extrasolar planets are always increasing in mass. D) Doppler measurements are very difficult, producing noisy data that often cause astronomers to underestimate a planet's mass.
If bulb C were unscrewed: _________
a. bulb A and bulb B would be equally bright. b. bulb A would be brighter than bulb B. c. bulb A would be dimmer than bulb B. d. bulb A would go out. e. bulb B would go out.