Which of the following is NOT a greenhouse gas?
A) water (H2O)
B) molecular oxygen (O2)
C) carbon dioxide (CO2)
D) methane (CH4)
B) molecular oxygen (O2)
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Has Polaris always been the "North Star" , also known as the "Pole Star" ?
a. No, because the Earth's axis slowly changes the direction it points. b. No, because it is a young star which formed only a few hundred years ago. c. Yes, because stars position change little over many centuries. d. No, because the Milky Way blocked our line of site to it for a long time.
Two blocks are accelerated across a horizontal frictionless surface as shown. Frictional forces keep the two blocks from sliding relative to each other, and the two move with the same acceleration. If F = 1.2 N and M = 1.0 kg, what is the horizontal component (frictional force) of the force of the large block on the small block?
a.
0.40 N to the left
b.
0.80 N to the right
c.
0.40 N to the right
d.
0.80 N to the left
e.
1.20 N to the left
Suppose you stretch a rubber band. The work you do on the rubber band is
A. positive. B. negative. C. zero.
The first to be credited with the idea that energy was quantized was
A) Max Planck. B) Albert Einstein. C) both Planck and Einstein at about the same time.