In the scattering of fast alpha particles by a thin foil of gold, Rutherford and his collaborators observed
A. cathode rays emerging from the foil.
B. most of the alpha particles bouncing straight back with very few passing through the foil undisturbed.
C. a very few alpha particles scattered through large angles with most undergoing very little scattering.
D. alpha particles interacting with nuclei to produce beta rays and alpha particles moving equally in all directions.
Answer: C
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The geological feature in this photo is
A) an impact crater. B) a volcano. C) the unusual cloud formation in the background. D) a dried up lake basin.
The Ptolemaic model has planets moving in
A) elliptical orbits about the Sun B) a simple circle about the Earth C) a simple circle about the Sun D) small circles, the centers of which move in a larger circle about the Earth
Which of the following statements about scientific theories is not true?
A) A theory can never be proved beyond all doubt; we can only hope to collect more and more evidence that might support it. B) A theory cannot be taken seriously by scientists if it contradicts other theories developed by scientists over the past several hundred years. C) A theory is a model designed to explain a number of observed facts. D) A theory must make predictions that can be checked by observation or experiment. E) If even a single new fact is discovered that contradicts what we expect according to a particular theory, then the theory must be revised or discarded.
Three solid, uniform, cylindrical flywheels, each of mass 65.0 kg and radius 1.47 m, rotate independently around a common axis through their centers
Two of the flywheels rotate in one direction at 8.94 rad/s, but the other one rotates in the opposite direction at 3.42 rad/s. Calculate the magnitude of the net angular momentum of the system. A) 1020 kg ? m2/s B) 1500 kg ? m2/s C) 975 kg ? m2/s D) 940 kg ? m2/s