# QB/AstroPluto and planetary mass

< QB

• Quizbank now resides on MyOpenMath at https://www.myopenmath.com (although I hope Wikiversity can play an important role in helping students and teachers use these questions!)
• At the moment, most of the physics questions have already been transferred. To see them, join myopenmath.com as a student, and "enroll" in one or both of the following courses:
• Quizbank physics 1 (id 60675)
• Quizbank physics 2 (id 61712)
• Quizbank astronomy (id 63705)

The enrollment key for each course is 123. They are all is set to practice mode, giving students unlimited attempts at each question. Instructors can also print out copies of the quiz for classroom use. If you have any problems leave a message at user talk:Guy vandegrift.

See special:permalink/1863360 for a wikitext version of this quiz.

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\title{AstroPluto and planetary mass}
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Attribution for each question is documented in the Appendix}
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\question Which of the following is NOT used to measure the mass of a planet\ifkey\endnote{ placed in Public Domain by Guy Vandegrift: {\url{https://en.wikiversity.org/wiki/special:permalink/1863360}}}\fi
\begin{choices}
\CorrectChoice the rotation of the planet about its axis
\choice the motion of an artificial satellite
\choice the motion of a moon
\choice the motion of a neighboring planet
\choice all of these have been used
\end{choices}

\question What is unusual about calculations of the mass of Pluto made in the early part of the 20th century?\ifkey\endnote{ placed in Public Domain by Guy Vandegrift: {\url{https://en.wikiversity.org/wiki/special:permalink/1863360}}}\fi
\begin{choices}
\choice The estimates were correct to within less than 10%
\choice The estimates were too low.  Pluto was actually more massive than they thought.
\CorrectChoice The estimates were high.  Pluto was less massive than they calculated
\choice It was the first time a moon was used to calculate the mass of a planet
\choice It was the first time a planet's period of orbit around the sun was used to calculate the planet's mass
\end{choices}

\question Why was the discovery of Pluto peculiar?\ifkey\endnote{ placed in Public Domain by Guy Vandegrift: {\url{https://en.wikiversity.org/wiki/special:permalink/1863360}}}\fi
\begin{choices}
\choice It was discovered during a survey looking for stars
\choice It was seen by Galileo, who thought it was a star
\CorrectChoice It was discovered by a calculation based on flawed assumptions
\choice It was seen by Halley, who was looking for comets
\choice It was the first time a planet's period of orbit around the sun was used to calculate the planet's mass
\end{choices}

\question Which of the following is NOT used to measure the mass of a planet\ifkey\endnote{ placed in Public Domain by Guy Vandegrift: {\url{https://en.wikiversity.org/wiki/special:permalink/1863360}}}\fi
\begin{choices}
\choice the motion of an artificial satellite
\choice the motion of a moon
\choice the motion of a neighboring planet
\CorrectChoice all of these have been used
\end{choices}

\question Which statement describes the relation between Pluto and Neptune\ifkey\endnote{ placed in Public Domain by Guy Vandegrift: {\url{https://en.wikiversity.org/wiki/special:permalink/1863360}}}\fi
\begin{choices}
\choice Pluto's orbit lies outside Neptune's orbit
\choice Pluto's orbit intersects Neptune's orbit an the two bodies will eventually collide
\choice Pluto's orbit intersects Neptune's orbit but they avoid each other because Pluto's mass is too small
\CorrectChoice Pluto's orbit intersects Neptune's orbit but they don't collide because of an orbital resonance between the two
\end{choices}

\end{questions}
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