Physics Class

Jorge A. Calderón Hernández

In our physics class we have studied the laws of nature and we have been able to understand more the world around us. Between our class with the professor Junqiang Lu and the class text book, we have acquired knowledge and we have even discovered that sometimes we were wrong with what we thought was happening with the things we studied. Something I must admit is that, one of the main reasons that I enjoyed reading the book was because we were able in every chapter to ask ourselves a question about what we thought would have happened to the object when it was passing through some circumstances. Sometimes we were correct, but other times when we learned the material we found ou that we had a misconception of what was going on. In this assignment, our professor ask us to talk about a law that we learned during class and to try and think what would happen if that law was incorrect. The law that I decided to use was the Water Pressure law, this law shows that the pressure increases with depth. Sometimes people think that the pressure is measured by the amount of fluid it has, but that way of thinking isn’t exactly right. It doesn’t matter how much liquid you have to your right or left if you stay at the same depth you will feel the same pressure as if you were at that same depth. I think people misunderstand the law because they associate pressure with all the water that oceans and seas have. But we have to understand that for example you will feel the same pressure if you are at the bottom of a 9 inch deep pool even if is a small pool in width or the biggest pool in width. Having clarified this law, the assignment is to imagine what could happen if this law wasn’t true. So I remembered the movie called Atlantis, it was about a lost empire beneath the ocean. So I decided to believe what if... what if the pressure wasn’t any more determined by the depth of the object, it would be easier to discover the fascinating world under the ocean. A person should only worry about not running out of tank air and wouldn’t have any more difficulties. So I decided to learn a little more about pressure under water and what the divers have to go through when they decide to enter a litter deeper then the usual. So I read an article called “The Physics of diving” (web page: “http://library.thinkquest.org/28170/32.html”) were I learned that divers too much pressure because the tissues that a human organism has, contains a sixty-five percent of liquids that practically do not shrink. I also learned that when the divers are descending, they do not feel the increasing pressure, they only feel difficult by breathing because they are inhaling gases that are under a pressure equal to that of the surrounding water. This pressure I believe as deeper will get stronger based on the law and could in the long run kill the diver. But right now, thinking that we could eliminate the water pressure law, we could say that the diver could go as deep as he liked to, as long as he has a lot of air in the tank and could easily discover mire mysteries under the ocean that haven’t even been brought to discovery. It would be easier to discover the lost empire of Atlantis. Thank you for letting me discover more and learn more about the world we live in, it was a fun activity.