A volume of gas is decreased by half while the temperature remains constant. How much does the gas pressure change?
The new pressure will be twice as great.
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Which of the following statements about lunar phases is true?
A. The full Moon sometimes rises around midnight B. The time between new Moons is two weeks. C. It is possible to have two full Moons during January but not usually during February. D. It is possible to have two full Moons during November but not during December.
Most stars in the Milky Way's halo are
A) very old. B) found inside molecular clouds. C) very young. D) blue or white in color.
Starting outside the region with the magnetic field, a single square coil of wire enters, moves across, and then leaves the region with a uniform magnetic field
perpendicular to the page so that the graph shown below represents the induced emf. The loop moves at constant velocity 
. As seen from above, a counterclockwise emf is regarded as positive. In which direction did the loop move over the plane of the page?
?
?
a.
The loop moved from bottom to top.
b.
The loop moved from top to bottom.
c.
The loop moved from left to right.
d.
The loop moved from right to left.
e.
All of these directions of motion will produce the graph of emf vs t.
During the course of a single night, a planet that is moving in retrograde motion will move
A. east to west. B. not at all. C. west to east. D. randomly about the sky.