Our Moon in Earth orbit travels fastest when it is
A) involved in an eclipse.
B) rotating.
C) revolving.
D) closest.
E) all of the above
Answer: D
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When you apply an alcohol swab to your skin, it feels cool because
A. the density of alcohol is less than 1 g per cm3. B. your skin transfers a bit of heat to the liquid alcohol and the alcohol evaporates. C. germs are destroyed by the alcohol, and they give off cold heat as they die. D. of nothing-it is an illusion, because evaporating alcohol is actually hotter than liquid alcohol.
Which of the following is an "exchange particle" for the electroweak force?
A) the photon B) the Z particle C) Both of the above. D) the W+ and W- E) All of the above.
The behavior of blackbody radiation was poorly explained until ________ produced an adequate theory
A) Wien B) Bohr C) Planck D) Jeans E) Rayleigh
Quarks come in what flavors?
a. up, down and strange c. red, green and blue b. charm, top and bottom d. all of the above