The Paleocene is a(n)
a. epoch.
b. era.
c. eon.
d. period.
a
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When we say that the Sun is a ball of plasma, we mean that ________
A) the Sun is made of material that acts like a liquid acts on Earth B) the Sun is roughly the same color as blood C) the Sun is made of atoms and molecules D) the Sun consists of gas in which many or most of the atoms are ionized (missing electrons)
The unit called the hertz (Hz) is equivalent to
a. 1/s only. b. a reciprocal second only. c. s-1 only. d. all of these.
Which of the following has not been detected around other stars in the Galaxy?
A) a collapsing nebula of gas B) flattened, spinning disks C) jovian planets D) asteroids E) strong stellar winds
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.