Nuclear energy could be part of the answer to the danger of the world's greenhouse warming
What will be an ideal response?
This is the case in the short term (say, for the coming century). Thermal systems
contribute waste heat, and if all the world's energy comes from thermal systems, there will
be a net increase in thermal energy directly from warming Earth.
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What is viscous dissipation?
What will be an ideal response?
When you throw a ball, the work you do to accelerate it equals the kinetic energy the ball gains. If you do twice as much work when throwing the ball, does it go twice as fast?
a) Yes. Twice as much work will give the ball twice as much kinetic energy. Since KE is proportional to the speed, the speed will double as well. b) Yes. Twice as much work will give the ball four times as much kinetic energy. Since KE is proportional to the speed squared, the speed will be the square root of 4, or twice as fast. c) No. Twice as much work will give the ball twice as much kinetic energy. But since KE is proportional to the speed squared, the speed will be ?2 times larger. d) No. Twice as much work will give the ball four times as much kinetic energy. Since KE is proportional to the speed, the speed will be four times larger.
Diffusion is described by
A) Boyle's law. B) Kepler's law. C) Charles' law. D) Graham's law. E) Archimedes' law.
A 45.0-kg person steps on a scale in an elevator. The scale reads 460 N. What is the magnitude of the acceleration of the elevator?
A) 0.422 m/s2 B) 4.91 m/s2 C) 46.9 m/s2 D) 0.206 m/s2 E) 9.81 m/s2