The equivalence principle says that a person in an elevator that is in freefall feels the same acceleration as
A) a person in an elevator going up with an acceleration of g.
B) a person in space, far from any gravitational source accelerating at g.
C) a person in an elevator going down with an acceleration of g.
D) a person in space, far away from any gravitational source with no acceleration.
E) a person in orbit of Earth accelerating at g upward.
B
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Energy Conservation With Conservative Forces: A roller coaster starting from rest descends 35 meters in its initial drop and then rises 23 meters when it goes over the first hill, which has a circular shape over the top. If a passenger at the top of the hill feels an apparent weight equal to one-half of her normal weight, what is the radius of curvature of the first hill? Neglect any frictional losses.
Fill in the blank(s) with the appropriate word(s).
Based on the given right ascensions and declinations, which of the following stars lies closest to the north celestial pole on the celestial sphere?
A) Sirius: RA = 6hr 45m, dec = -16°42' B) Canopus: RA = 6hr 24m, dec = -52°41' C) Alpha Centauri: RA = 14hr 40m, dec = -60°50' D) Arcturus: RA = 14hr 16m, dec = +19°11' E) Vega: RA = 18hr 37m, dec = +38°47'
Emperor penguins are part of the species forsteri and genus aptenodytes. Given this, their scientific classification would be written
A) Aptenodytes Forsteri B) forsteri Aptenodytes C) Forsteri aptenodytes D) Aptenodytes forsteri
Gamma rays are
A) made up of helium nuclei. B) made up of electrons. C) a form of beta radiation. D) rays of light. E) a form of electromagnetic radiation.