tag:blogger.com,1999:blog-89368100113350338392011-11-27T16:08:10.476-08:00Physics hates youMentokhttp://www.blogger.com/profile/10611036146019448010noreply@blogger.comBlogger31100tag:blogger.com,1999:blog-8936810011335033839.post-48990040872163546622008-01-16T12:35:00.000-08:002008-01-22T05:22:28.105-08:00<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.forkosh.dreamhost.com/mimetex.cgi?%5Cfrac%7B34%7D%7B23%7D"><img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 16px;" src="http://www.forkosh.dreamhost.com/mimetex.cgi?%5Cfrac%7B34%7D%7B23%7D" alt="" border="0" /></a><br /><br /><br />Last post we looked at what a vector looks like, and why we need them. Now we're going to finally learn what a vector <span style="font-style: italic;">really </span>is.<br /><br />Let's take a look at the vector we saw in our last post:<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://3.bp.blogspot.com/_QytLldfJNQk/R466yxdfbcI/AAAAAAAAACk/H54oSJFqwHs/s1600-h/vector.bmp"><img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer;" src="http://3.bp.blogspot.com/_QytLldfJNQk/R466yxdfbcI/AAAAAAAAACk/H54oSJFqwHs/s320/vector.bmp" alt="" id="BLOGGER_PHOTO_ID_5156264004819054018" border="0" /></a><br /><br />The angle of this vector is 30 degrees, and the magnitude (length) of the vector is 2.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8936810011335033839-4899004087216354662?l=plugandchug.blogspot.com' alt='' /></div>Mentokhttp://www.blogger.com/profile/10611036146019448010noreply@blogger.com1tag:blogger.com,1999:blog-8936810011335033839.post-55557795459196028552007-12-28T15:54:00.001-08:002008-01-23T07:18:05.445-08:00This is what a vector looks like:<a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://3.bp.blogspot.com/_QytLldfJNQk/R5FZaBdfbdI/AAAAAAAAACs/trWsrua1fA0/s1600-h/vector.bmp"><img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer;" src="http://3.bp.blogspot.com/_QytLldfJNQk/R5FZaBdfbdI/AAAAAAAAACs/trWsrua1fA0/s320/vector.bmp" alt="" id="BLOGGER_PHOTO_ID_5157001351919529426" border="0" /></a><br />It's shown as an arrow, which has two properties:<br /><ol><li>It has a magnitude (it's length, 2 Newtons)</li><li>It has a direction (it's angle, 30 degrees)<br /></li></ol>A vector is not a number. A number has only one property, which is it's value. What is a vector? Whatever you just though was <span style="font-size:130%;">WRONG.</span><br /><br /><span style="font-size:130%;">A VECTOR IS BASICALLY A LIST OF NUMBERS.</span><br /><br />I know what you're thinking: "I thought you said a vector was an arrow". <span style="font-size:130%;">I DIDN'T SAY THAT. </span> A vector is just usually represented as an arrow, because it's easier for humans to understand and work with.<br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.forkosh.dreamhost.com/mimetex.cgi?%20%5Cvec%7BF%7D"><img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer;" src="http://www.forkosh.dreamhost.com/mimetex.cgi?%20%5Cvec%7BF%7D" alt="" id="BLOGGER_PHOTO_ID_5157001351919529426" border="0" /></a><br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.forkosh.dreamhost.com/mimetex.cgi?6%5Chat%7Bx%7D%20+%202%5Chat%7By%7D"><img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer;" src="http://www.forkosh.dreamhost.com/mimetex.cgi?6%5Chat%7Bx%7D%20+%202%5Chat%7By%7D" alt="" id="BLOGGER_PHOTO_ID_5157001351919529426" border="0" /></a><br /><br /><a onblur="try {parent.deselectBloggerImageGracefully();} catch(e) {}" href="http://www.forkosh.dreamhost.com/mimetex.cgi?%5Cleft%28%20%5Cbegin%7Barray%7D%7Bc%7D%3Cbr%3E6%20%5C%5C%3Cbr%3E2%20%5Cend%7Barray%7D%20%5Cright%29"><img style="margin: 0px auto 10px; display: block; text-align: center; cursor: pointer;" src="http://www.forkosh.dreamhost.com/mimetex.cgi?%5Cleft%28%20%5Cbegin%7Barray%7D%7Bc%7D%3Cbr%3E6%20%5C%5C%3Cbr%3E2%20%5Cend%7Barray%7D%20%5Cright%29" alt="" id="BLOGGER_PHOTO_ID_5157001351919529426" border="0" /></a><br /><br /><span style="font-size:100%;">But all of these three representations mean the same thing.<br /><br />Alright, you'll probably mess this up. This involves a little trigonometry. Remember this:<br /><br /></span><div style="text-align: center;"><span style="text-decoration: underline;"></span></div><div style="text-align: center;"><img src="http://www.forkosh.dreamhost.com/mimetex.cgi?%20%5Csin%28%5Ctheta%29%20=%20%5Cfrac%7Bopposite%7D%7Bhypotenuse%7D" align="middle" border="0" /> and <img src="http://www.forkosh.dreamhost.com/mimetex.cgi?%5Ccos%28%5Ctheta%29%20=%20%5Cfrac%7Badjacent%7D%7Bhypotenuse%7D" align="middle" border="0" /><br /></div><br /><br /><img src="http://www.forkosh.dreamhost.com/mimetex.cgi?%20%5Cvec%7BF%7D" align="middle" border="0" />, or <img src="http://www.forkosh.dreamhost.com/mimetex.cgi?6%5Chat%7Bx%7D%20+%202%5Chat%7By%7D" align="middle" border="0" />, or <img src="http://www.forkosh.dreamhost.com/mimetex.cgi?%5Cleft%28%20%5Cbegin%7Barray%7D%7Bc%7D%3Cbr%3E6%20%5C%5C%3Cbr%3E2%20%5Cend%7Barray%7D%20%5Cright%29" align="middle" border="0" /><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8936810011335033839-5555779545919602855?l=plugandchug.blogspot.com' alt='' /></div>Mentokhttp://www.blogger.com/profile/10611036146019448010noreply@blogger.com0tag:blogger.com,1999:blog-8936810011335033839.post-46032942813207685392007-12-28T13:19:00.000-08:002008-01-19T08:18:43.979-08:00I'm starting this blog because kids don't know their physics shit. That's right, you don't know shit about physics. I do know shit about physics and I'm going to tell you. I'm going to tell you:<br /><ul><li>Mechanics shit (angular and linear)</li><li>Vector shit<br /></li><li>Gravitation shit<br /></li><li>Electromagnetism shit<br /></li><li>Thermodynamics shit<br /></li><li>Wave shit<br /></li><li>Oscillations/Simple Harmonic Motion shit<br /></li><li>Energy and Momentum shit (including angular momentum)</li></ul>And lots of other shit too. <span style="font-size:130%;">Ask me shit. I'll answer.<br /></span><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/8936810011335033839-4603294281320768539?l=plugandchug.blogspot.com' alt='' /></div>Mentokhttp://www.blogger.com/profile/10611036146019448010noreply@blogger.com0