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Physics Ch 16
Special Relativity - length, momentum, and energy
| Question | Answer |
|---|---|
| if we witness events in a FOR moving past us, ime appears to be stretchde out (dialted) how do the lengths of objects in that frame appear? | smaller |
| how long would a meter stick appear if it were thrown like a spear at 99.5% the speed of light? | 1/10 its origingal length |
| how long would a meter stick appear if it were travling at 99.5% the speed of light, but with its length perpendicular to its dirctino of motion? (why are your answers to this and the last question different?) | the length doesnt change, bc contraction only happens in one direction, the direction of motion |
| if you were travling in a high speed spaceship, would meter sticks on a board appear contracted to you? | no, bc you are in that RF, distoration only appears in the 'other guys RF |
| what would be the momentum of an object if it were pushed to the speed of light? | infinity |
| what is meant by rest mass? | the mass of an object no matter what speed |
| what relativistic effect is evident when a beam of high speed charged particales bends in a magnetic field? | its momentum is small, therefore the beam bends |
| what is meant by the equivalence of mass and energy? that is, what does the equation E=mc² mean? | mass and energy are the same |
| what is the numerical quanity of the ratio rest energy/rest mass? | C²=E/m |
| does the equation E=mc² apply to reaction that involve the atomic nucleus? | the equation is universal |
| what evidence is ther for the equivalence of mass and energy? | nuclear power |
| what effect does solar energy have on the mass of the sun? | as solar energy is released, the mass of the sun decreases |
| an object at rest has an 'energy of being,' E=mc². when the same object is moving, is its total energy the same as, more, than, or less than E=mc²? | total energy is greater |
| does the relativistic equation for kinetic energy mathematically reduce to the Newtonian equation for kinestic energy at low speeds? | yes |
| how much kinetic energy would a partical have if it could move at the speed of light? | infinity kinetic energy |
| what is the correspondence principle? | when a new theory is valid, it must account for the verified results of the old theory in the region where both theories apply |
| what results when low everyday speeds are used in the relavistiv equations for time and length? | time and length are essentially unchanged |
| do the equations of newton and einstein overlap, or is there a sharp break between them? | they overlap |
Created by:
meglea90