Two thin cables, each having a diameter of d 5 t/6 and carrying tensile loads P, are bolted to the top of a rectangular steel block with cross-sectional dimensions b 3 t. The ratio of the maximum tensile to compressive stress in the block due to loads P is:
(A) 1.5
(B) 1.8
(C) 2.0
(D) 2.5
(B) 1.8
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In the H-R diagram, 90 percent of all stars are
a. in the giant region. b. in the supergiant region. c. among the B stars. d. among the G stars. e. on the main sequence.
When one travels west while passing over the International Date Line,
a. the date is decreased one day. b. the time is decreased one hour. c. the time is advanced one hour. d. the date is advanced one day. e. none of these occurs.
Which of the following applies to Io?
A) It is the most volcanically active body in the solar system. B) It is thought to have a deep, subsurface ocean of liquid water. C) It is the only moon in our solar system with an atmosphere thicker than Earth's atmosphere. D) It is the largest moon in the solar system. E) It is probably a captured Kuiper belt object.
You discover a binary star system in which one star is a 15 MSun main-sequence star and the other is a 10 MSun giant. How do we think that a star system such as this might have come to exist?
A) The giant must once have been the more massive star, but it is now less massive because it transferred some of its mass to its companion. B) Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main-sequence stars millions of years later than its less massive companion. C) The two stars probably were once separate, but became a binary when a close encounter allowed their mutual gravity to pull them together. D) The two stars are simply evolving normally and independently, and one has become a giant before the other.