A weight lifter can bench press 171 kg. How many milligrams (mg) is this?
A) 1.71 × 108 mg
B) 1.71 × 109 mg
C) 1.71 × 107 mg
D) 1.71 × 106 mg
A
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Edgar Jones, angry at having purchased a tasteless pizza, drops his pizza off the Brooklyn bridge. As it falls, Edgar's pizza has a constant [or unchanging]
(NOTE: Neglect air resistance.) A) velocity. B) speed. C) acceleration. D) position. E) All of the above.
You are packing for a trip to another star, and on your journey you will be traveling at a speed of 0.99c. Can you sleep in a smaller cabin than usual, because you will be shorter when you lie down? Explain your answer
1.No; from your perspective you’re at rest with respect to the cabin, so you will measure yourself as having your normal length, and will require a normal-sized cabin. 2.Yes, if your bed is oriented along the direction of motion, because length contraction only takes place along this direction.
According to the solar nebula theory, planetary development in the solar nebula began with:
A) the growth of dust grains. B) the formation of ice caps. C) the fission of helium atoms. D) the fission of hydrogen atoms.
What evidence supports the galactic fountain model?
A) We see a jet of ionized gas shooting out of the bulge of our galaxy. B) We have mapped several spiral arms of the Milky Way Galaxy. C) We see hot gas above the disk of the galaxy and cool gas that appears to be raining down from the halo. D) We have observed a lot of water molecules in the interstellar medium. E) We have no evidence yet for the galactic fountain model.