Recent content by Neoriginal

It turns out I've been studying the wrong things this whole weekend. What I really need to focus on is circular motion, momentum, work, and energy.

Would it be: A × B = 17i - 19j - 33k A · B = 10 + 7 + 6 = 23I've moved on to finding magnitudes. Calculate the magnitude of A = (5, -4, 3) [(5^2) + (-4^2) + (3^2)]^1/2 = (50)^1/2 Is that correct? If I find the magnitude of |A × B| it would be: A × B = 17i - 19j - 33k [(17^2) + (-19^2)...

I'm confused here. What three numbers do I have to add up?

Oh, I guess I did mix them up. So, are the values I got for i, j, and k incorrect? I've been looking at the dot product and it seems much easier than the cross product. If I were to get the dot product of my original equation: A = (2i - 3j + 7k) B = (5i + j +2k) A dot B = 10 + (-3) + 14 is...

Thank you for that website. Could you please tell me if my answer for the cross product of A and B are correct?

I just looked at a cross product video on Youtube and am now trying to solve questions from my textbook. Currently this one: A = (2i - 3j + 7k) B = (5i + j +2k) From the math I've done, I have calculated AxB to be 35. Is that correct? i = -13 j = 31 k = 17 I feel slightly more confident...

This is straight from the textbook: "From the geometric point of view, a vector is a directed line segment. In order to describe a vector we must specify both its length and direction. If two vectors have the same length and and the same direction they are equal." Connect the tail of vector A...

A perpendicular line? <---.---> Would that be a vector sum of zero?

Freshman in college. There's no way I can work out the problems if I don't get the concepts. What I need help with is understanding the concepts. Only then can I begin to work out a problem. That would be the equivalent of someone coming to me and asking if I can help them build a computer. My...

No replies? :[ I've been reading over the intro chapters.. but it's still confusing (the book is "An Introduction to Mechanics" by Kleppner)

My final for Physics is coming up and I really, really ****ed up in this class. I don't even know how to do dot products, cross products, or let alone Newton's laws. We applied Newton's laws to some pulley problems I think. I've been going to all the lectures but it just doesn't stick -- nothing...

Yeah I think you might be right. The half-point is 25.5km and it would take each train .75 hours (40 minutes) to collide. The bird's velocity is a given 60km/h so you would multiply 60(.75) to get 45km.