What role did Percival Lowell play that led to the discovery and naming of Pluto?
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He predicted the existence of "Planet X" and its position, and began the search for it at his observatory before his death. When Clyde Tombaugh found it while continuing the search at Lowell Observatory, Pluto was close to the position Lowell had expected, but this turned out to be just luck.
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A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because:
A. the ball becomes positively charged by induction B. the ball becomes negatively charged by induction C. the number of electrons in the ball is more than the number in the rod D. the string is not a perfect insulator E. there is a rearrangement of the electrons in the ball
How does the explosion of a nuclear bomb provide evidence for the theory of relativity?
A) The mass of the bomb when it explodes is much greater than its normal mass. B) bomb causes things in its vicinity to move at very high speeds, allowing scientists to measure effects of time dilation. C) The bomb shortens the lifetimes of all people who happen to be near it when it detonates. D) The bomb converts rest-mass energy into thermal energy in accord with E = mc2, which is part of the theory of relativity.
Assume you are a particle in a box called the universe. Estimate your minimum kinetic energy. (Assume the "edge" of the box is at a distance of 20. Giga Light Years.)
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Estimate the maximum superheat temperature allowable for nucleate pool boiling of methanol.
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