An 800-N billboard worker stands on a 4.0-m scaffold weighing 500 N and supported by vertical ropes at each end. How far would the worker stand from one of the supporting ropes to produce a tension of 770 N in that rope?
a. 1.4 m
c. 2.5 m
b. 2.0 m
d. 2.7 m
A
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The buoyant force on an object is least when the object is
A) partly submerged. B) submerged near the surface. C) submerged near the bottom. D) none of the above
In a spectroscopic binary system, the star showing the larger blue shift is
A) cooler and receding the fastest. B) less massive of the pair and receding slower. C) more massive and approaching us. D) less massive and approaching us at this moment. E) hotter and receding faster.
When the temperature of a quantity of 0°-C air at constant pressure is lowered by 1 degree, its volume
A) shrinks by 1/273. B) shrinks by 100/273. C) increases by 1/273. D) increases by 100/273.
A nuclear chain reaction is possible because, for the isotopes that can participate in a chain reaction, each nucleus when fissioned
A. produces more neutrons than are required to fission one nucleus. B. produces more energy than is required to fission one nucleus. C. produces daughters that can also be fissioned to produce more energy. D. produces daughters that can fuse together to make more of the same isotope.