What are some of the things that make Earth unique in the solar system?
What will be an ideal response?
It is the only planet with an oxygen-rich atmosphere and abundant liquid water on its surface (although there are hints that there may be liquid water on some of the moons around the jovian planets). Its surface temperature is such that water can exist in three phases: solid, liquid, and gaseous. Compared to its size, Earth also has by far the largest moon in the solar system, so much so that some astronomers consider it a double planet. Finally, Earth is the only planet we know of that harbors life.
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Current: When a current flows through a metal wire, the moving charges are
A. only protons. B. only electrons. C. both protons and electrons. D. positive metal ions. E. negative metal ions.
The frictional force of the floor on a large suitcase is least when the suitcase is
A. pushed by a force parallel to the floor. B. dragged by a force parallel to the floor. C. pulled by a force directed at an angle ? above the floor. D. pushed by a force directed at an angle ? into the floor. E. turned on its side and pushed by a force parallel to the floor.
Describe some of the results from the Cassini/Huygens mission to Saturn and its moons
What will be an ideal response?
As shown below, a square loop of wire of side a moves through a uniform magnetic field of magnitude B perpendicular to the page at constant velocity
directed to the right. Which statement regarding the electric field induced in the wires is correct for the wires at the left and right sides of the loop?
?
a.
The electric field 
is directed upwards in both the right and left sides of the loop.
b.
The electric field s directed upwards in the right side and downwards in the left side of the loop.
c.
The electric field is directed upwards in the left side and downwards in the right side of the loop.
d.
The electric field is directed downwards in both the right and left sides of the loop.
e.
There is no electric field present in any side of the loop.