Which of the following best describes the current scientific view of possibilities of travel to distant parts of our galaxy (or universe) with such things as hyperspace, wormholes, or warp drive?
A) We do not know if travel in any of these ways is really possible, but they do not contradict any known laws of physics.
B) There is no doubt that such travel is possible, though it remains well beyond our current technology.
C) They sound like fun, but they are not possible because they allow faster-than-light travel.
D) They seemed to be allowed by special relativity, but general relativity does not allow for them.
A
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That brighter Sirius A weighs 3 solar masses, but the white dwarf Sirius B is only about one solar mass implies:
A) that white dwarfs evolve slower than main sequence stars. B) that the collapsed companion transferred mass to Sirius A. C) that there should be a planetary nebula around the Sirius system. D) that Sirius A will be stable three times longer than Sirius B. E) the Sirius A will end up as a black hole, not a white dwarf like its companion.
Burl and Paul have a total weight of 1300 N. The tensions in the ropes that support the scaffold they stand on add to 1700 N. The weight of the scaffold itself must be
A) 400 N. B) 500 N. C) 600 N. D) 800 N.
The charge flowing through a light bulb attached to a 12.0-V battery in 11.0 s is 30.0 C. What is the total energy delivered to the filament during this process?
a. 12.0 J b. 360 J c. 3 960 J d. 132 J e. 690 J
A skater rotates quickly on the ice. He pushes his arms out. What happens to his rotational kinetic energy?
1.It increases. 2.It decreases. 3.It stays the same. 4.It is impossible to determine.