What contribution to astronomy was made by Tycho Brahe?

A) The planets' orbits around the Sun are ellipses, not circles.
B) The Earth is not the center of the Universe.
C) His observations of planetary motion with great accuracy proved circular orbits could not work.
D) His telescope revealed the moons of Jupiter before Galileo noted them.
E) Retrograde motion must be explained by epicycles larger than those of Ptolemy.


C

Physics & Space Science

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A bar magnet is falling through a loop of wire with constant velocity. The south pole enters first. As the magnet leaves the wire, the induced current (as viewed from above):

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a.
b.
c.
d.
e.

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If you hold one end of a metal bar against a piece of ice, the end in your hand will soon become cold. Does cold flow from the ice to your hand?

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