Exam 2: Gravitation and the Waltz of the Planets

If you were to look back from your spacecraft toward the solar system and you measured that the angle between Earth and the Sun was 1 second of arc,how far from the Sun would you be? (Assume that the Earth-Sun line is at right angles to your line of sight.)

The synodic period of a planet is defined as the time between two successive:

In the geocentric model of the solar system,which one of the following phases of Venus should be visible from Earth?

In the path of Mars against the background stars shown in Figure 2-2 in Comins,Discovering the Essential Universe,6th ed.,the planet appears from Earth to move in a loop,moving westward for a period of time.What is the angle between the Earth-Sun line and the Earth-Mars line when the planet is halfway through the retrograde motion,on about February 1?

Suppose we were to observe two supernovas (exploding stars)exploding in the night sky on a particular night.If one was in the nearby arm of the Milky Way Galaxy while the other was in the Andromeda Galaxy,M31,2 million light-years away from us,which of the following statements concerning the actual explosion times of these supernovas is CORRECT?

An inhabitant of a planet orbiting the star Betelgeuse observes the flash from the first nuclear weapon on Earth,exploded in July 1945.If this extraterrestrial being were to send a signal to Earth immediately to confirm this sighting by exploding a bomb of equivalent brightness,and astronomers on Earth were watching his planet,when would they expect to see the flash?

A person standing on bathroom scales sees a reading of 148 pounds.This person is acted on by:

A rocket that is accelerated by the force from the ejection of large quantities of hot gases represents an example of which physical law originally stated by Newton?

Newton stated that if a force were applied to an object in space,the resultant acceleration would depend on the:

Ptolemy's system of the heavens put Earth at or near the center.The motivation for this choice was primarily:

A vital part of the scientific hypothesis is that it:

On a larger scale,the solar system itself orbits the:

In the geocentric universe,when is the planet closest to Earth?

Tycho demonstrated that the supernova of 1572 was far from Earth by showing that:

The maximum elongation of the orbit of Saturn is:

A major theme of ancient Greek philosophy was that stars and planets in the sky:

An asteroid-like object (or a cometary nucleus)is seen to be orbiting the Sun in a circular path with a period of 120 years.What is its distance of closest approach to Earth (the separation distance when the object is at opposition)? (Be careful with your answer; a diagram might be helpful.)

The Copernican system for planetary motions is:

Which of the following planetary configurations or positions is IMPOSSIBLE for one of the outer planets?

What happens to objects that acquire enough energy to transition to hyperbolic orbits within the solar system?