When a light ray passes at a non-90° angle from water into air, it
A) bends toward the normal.
B) bends away from the normal.
C) travels much slower.
Answer: B
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Suppose the half-life of an isotope is 2 days. You purchase 10 grams of the isotope, but it was produced in a laboratory 4 days before it was delivered to you. How much of this isotope will you have 3 days after it was delivered to you?
A) more than 2.5 grams but less than 5 grams B) 2.5 grams C) more than 1.25 grams but less than 2.5 grams D) 1.25 grams E) less than 1.25 grams
A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three are released simultaneously at the top of an inclined plane, and roll without slipping which will reach the bottom first?
A) sphere B) pipe C) cylinder D) they all reach bottom in the same time E) It depends on the angle of inclination.
The conservation of energy applies to satellites in
A) circular orbit. B) elliptical orbit. C) both of these D) neither of these
Millisecond pulsars that are very old are
a. believed to be the result of mass transfer from a companion that increased the spin of the pulsar. b. all single objects. c. not spinning as rapidly as they seem because they have four hot spots that produce the flashes. d. X-ray binaries. e. gamma-ray bursters.