Classical theory predicts that the planets can orbit the Sun quite stably
Why could not stable orbits be predicted for the atom by simply substituting the electrical attraction for the gravitational attraction? Why was there a classical crisis in describing the atom?
An electron, classically orbiting the nucleus, is accelerating and electromagnetic theory says it should radiate, and thus the orbit would rapidly decay. A long lived stable atom could not be explained classically.
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Which arrow best indicates the direction of the electric field at point P created by the charge distribution on the sphere’s surface?
A. A B. B C. C D. D E. Zero F. AA G. BB H. CC I. DD
You are alone in space and your tether brakes and you are floating motionless relative to your spaceship, which is located a frustrating 10 meters away. Your spacesuit has no jet pack and you have no air to spare. All you have is your wrench. How can you return to your ship?
Fill in the blank(s) with the appropriate word(s).
What is the charge on 1.0 kg of protons?(e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A) 1.0 C B) 1000 C C) 9.6 × 107 C D) 6.0 × 1026 C E) 6.0 × 1023 C
The 50-kg stuntman places a 50-kg uniform 6-meter plank on top of a skyscraper and stands on the tip of it that overhangs the building as shown. What is the approximate distance that the overhang can be extended without disaster?
1) 0.5 m 2) 1 m 3) 1.5 m If the 6-meter board has a mass of only 25 kilograms, then the maximum overhang distance would be about 5) 0.5 m. 6) 1 m. 7) 1.5 m. 8) 2 m.