phys203 - homework 5_Solutions - light, which is...

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Homework 5 1. It is possible for a person to travel into the future of another person because say, for instance, that someone travel in space at around the speed of light, c. Upon, his/her return he/she would visit a friend. Now that friend would have felt that more time had gone by than the traveler. This is because when a person travels at nearly the speed of light, time is slowed down, making it seem like he/she is in the future. Furthermore, the two people were not traveling at the same velocity relative to each other, and so time is different for the two parties. It is not possible to travel into one’s own future because you are not traveling relative to anything but your self. If you are going at a faster speed, time seems slower, but you remain in the present. You can’t be traveling in an instance where time is slower and speed it up at the same time. It is impossible to travel to the past because that would require moving faster than the speed of
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Unformatted text preview: light, which is impossible. 2. If a person was actually able to travel at a velocity close to the speed of light, his/her lifespan could hypothetically increase. This is because once you travel that fast, extremely far distances can be reached instantaneously. The flow of time would be drastically reduced, possibly at a standstill. 3. A light year is the distance that light will travel over the course of one year, if there were no outside factors; simply, in a vacuum. This distance is around 5.87910 12 miles. 4. Someone on a star ten million light years away would not be able to see pyramids in Egypt. They are seeing things delayed by at least 10 million years, if the light was not blocked or slowed by anything, and so this was way before the time of pyramids in Egypt. 5. You would get the maximum horizontal distance by throwing the ball at an angle of 45 degrees. 6. 7. 8. 9....
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