The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is
A) a continuum, strongest in the color red.
B) a few bright lines against a dark background.
C) a few dark lines in the continuum.
D) a continuum, but with both bright and dark lines mixed in.
E) not in the visible portion of the spectrum.
B
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A 2 kg ball is floating in water. The volume displaced by the ball is
A. 0.005 
B. 0.004
C. 0.003
D. 0.002
E. 0.001
An object, initially moving in the negative x direction, is subjected to a change in velocity in the negative y direction. If the resulting velocity vector is drawn from the origin, into which quadrant does this vector point?
a. 1st b. 2nd c. 3rd d. None, since the object is now moving in the negative y direction.
The clouds on Venus are made primarily of ________
Fill in the blank(s) with correct word
Name the first three isotopes of hydrogen and their nuclide symbols, and indicate which is most common and which is most unstable
What will be an ideal response?