Gamma-ray bursts seem to be associated with violent events involving _______________
a. planets b. neutron stars
c. black holes d. neutron stars or black holes
d
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Why do we believe Earth has an iron core?
A. The properties of seismic waves match those expected of a region of iron. B. Samples from deep holes are iron rich. C. X-ray cameras show a dark, impenetrable mass at the planet's center. D. Astronomers have seen asteroid impacts sinking into the deep interior. E. Volcanoes erupt nearly pure iron.
Albedo changes may result from ______________ pollution
a. smog b. particulate c. gas d. noise
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.
_______________'s laws have been used for almost four centuries as a true description of orbital motion
Fill in the blank(s) with correct word