Velma, the space woman, orbiting at 100 miles above earth's surface, feels weightless because
A) she is in a vacuum.
B) she is away from the pull of earth's gravity.
C) she went on a diet.
D) she is falling freely around Earth.
E) Actually, she doesn't feel weightless.
D
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Which of the following statements about circumpolar stars is true at all latitudes?
A) They are the stars close to the north celestial pole.
B) They always remain above your horizon.
C) They make relatively small circles, traveling clockwise around the north celestial pole.
D) Like all other stars, they rise in the east and set in the west.
E) You cannot see them from the Southern Hemisphere.
At what angle must a fish underwater look in order to see a fisherman at the shore? (Note: n for water is 1.33.)
A) 41.2° B) 48.8° C) 60.0° D) 36.9° E) 90.0°
A substance that increases the rate of a chemical reaction but is not consumed in the reaction is called
a. an oxidizing agent. b. a catalyst. c. an activation agent. d. a reducing agent.
Light travels from one place to another along a path of least
A) distance. B) time. C) effort. D) expense. E) complication.