Thanks Alan. Yes, I understand a lot about the vectors but I didn't clearly know the difference between the cross multiplication and dot product/addition of forces. Here was much easier to ask than looking on Kahn. :)
We learnt this week, 3d vectors also solving with a matrix, and the information of the last 1/2 of your post. Your reply is now printed and a good reminder for this week at least while I wait for the text book to arrive. However the screen prints I posted were from last weeks lecture notes before we'd covered this more in depth. I guess that due to missing a lecture I just felt also that I may not have known the information while required knowing it to use in tutorial questions.I think most of the students felt this week a bit like the job was demanding given what we knew.
Additionally, I found that this week when trying to resolve the 3d vector equations, that I was trying to get a single answer in N rather than in the i, j, k form and leaving it in i, j, k. Thankfully it has become more clear now. This was the difference I needed to get my head around and which I was ultimately seeking somewhere within my search for answers, lol. Applying the cross multiplication solves for.. meaning what's at the root of it, what does it do exactly? r is lengths of the values of i j and x right, so then why do we use them to resolve magnitude? Also, if you do not have all the variables for the matrix will it generally come down to a quadratic or similtaneous eqaution which is solved by a matrix?
WE finished the tutorial this week on breaking down a similtaneous equation, into a quadradic and using the quadratic formula. So, we're catching up on the notes from last week as we dive a little deeper. Thanks again. It was not to confusing. It is just that the application is confusingas well as recalling all the information as required both that I have learnt recently or since the beginning of the course. It's becoming simpler though with a special thanks to the forum here and your self.
