One of Dirac's many achievements was a generalization of the "action-at-a-distance" concept. Feynman later improved upon that work by creating a space-time diagram to show that
a.
The Feynman diagram created a simple visual image for two particles interacting through a field, usually a quite complex mathematical and physical problem.
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Before about 4 billion years ago the universe was:
A) radiation dominated. B) quark dominated. C) lepton dominated. D) matter dominated. E) dark energy dominated.
An object that is initially at rest breaks up into two pieces of unequal masses when a spring-loaded device is released
If you compare the kinetic energy of the larger mass to that of the smaller mass immediately after they separate, which of the following statements is correct? A) The kinetic energy of the larger mass is greater. B) The kinetic energy of the smaller mass is greater. C) The kinetic energies of the two masses are equal. D) The total kinetic energy is zero J.
Glucose, C6H12O6, is a simple sugar that the body metabolizes into two molecules of pyruvic acid, C3H403. Is the glucose oxidized or reduced as it transforms into pyruvic acid?
A) The glucose is oxidized. B) The glucose is reduced. C) Parts of the glucose molecule are oxidized while others are reduced. D) Glucose is neither oxidized or reduced as it transforms into pyruvic acid.
When a material is cooled
A. it stays the same size B. it contracts C. it expands D. Some materials contract and some expand.