An uncharged spherical conducting shell surrounds a charge ?q at the center of the shell. The charges on the inner and outer surfaces of the shell are, respectively,
a.
?q, ?q.
b.
?q, +q.
c.
+q, ?q.
d.
+q, +q.
e.
+q, 0.
c
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The average temperature over the past 1000 years has been about 15?C?C. From the graphs, you can conclude that Earth's average temperature during the past 800,000 years has
A. varied between about 7?C and 19?C B. stayed remarkable steady, never varying by more than about 2?C C. never been as high as it is today D. varied between about ??10?C and +4?C
One of Galileo's strongest objections against the Earth-centered universe came from his observation of
a) The phases of Venus b) Precession of the Spin axis of our planet c) eclipse of the Sun d) the phases of the Moon E) the stars in the Milky Way
The Sun will get brighter in the next 4 to 5 billion years
Indicate whether the statement is true or false
The total momentum of a system will change during a collision unless the ________ force is zero.
Fill in the blank(s) with the appropriate word(s).