Recent content by fawk3s

Ofcourse! And plus I had made an arithmetic error too, so I should have really thought this through. Thank you for your help!

Homework Statement Let us have lines (x+3)/2 = (y+2)/3 = (z-6)/-4 and (x-5)/1 = (y+1)/-4 = (z+4)/1 Find a normal vector to the plane these two lines are on. The Attempt at a Solution I already know you can solve it by s1 x s2 || n ; where s1 = (2, 3, -4) and s2 = (1, -4, 1) but I am not...

Oh, so IV - III is calculated before III-I in the previous example. Makes perfect sense to me now. Thats why my version of the original problem was wrong. Thanks guys.

So what you're saying is that I am supposed to use the "new"/changed Row2 when doing further calculations to the rows? That wasnt followed in the following example (in class with the teacher): \pmatrix{0&1&1&1\\1&0&1&1\\1&1&0&1\\1&1&1&0} = - \pmatrix{1&0&1&1\\0&1&1&1\\1&1&0&1\\1&1&1&0} = -...

A = \pmatrix{1&1&1&1\\1&2&2&2\\1&2&3&3\\1&2&3&4} During the same step we subtract Row4 from Row2 subtract Row2 from Row3 subtract Row3 from Row4 ending up with A_1 = \pmatrix{1&1&1&1\\0&0&-1&-2\\0&0&1&1\\0&0&0&1} And the answer to be 0.

No. I changed the colors of what I did to the rows to blue. Look at my post again.

Homework Statement Lets find the determinant of 1 1 1 1 ... 1 1 2 2 2 ... 2 1 2 3 3 ... 3 1 2 3 4 ... 4 ... 1 2 3 4 ... n The Attempt at a Solution In class, we solved it by subtracting the previous line of every single line, ending up with 1 1 1 1 ... 1 1 2 2 2 ... 2...

Then explain to me, how do we "win" with force in this situation when most of it goes into balancing internal forces?

http://img13.imageshack.us/img13/2144/56032918.png http://img13.imageshack.us/img13/2144/56032918.png Alright, but I still can't deal with how we get more net force on that load nearer to the fulcrum. We just cleared that the net force/acceleration on the parts closer to the fulcrum...

That doesn't litterally mean you can't ask "why" questions, though. You can paraphrase my question to what's the cause behind the forces getting smaller towards the centerpoint in a circular motion. I mean, I can intuitively see the reason, as for velocity, the parts of the circle which are...

Why is the force from the segment closer to fulcrum (green) smaller than the force exerted by the segment farther away (red) and why does their sum vector get smaller toward the fulcrum? Thanks in adv

http://img834.imageshack.us/img834/7752/87101201.png http://img834.imageshack.us/img834/7752/87101201.png This is what I could make out of it. If that's what you were pretty much talking about, it describes the picture I posted about the tangential acceleration earlier. Doesnt really explain...

Would one of you mind doing a quick drawing? I am a little confused and not sure how it relates to larger forces being applied to the load closer to the fulcrum. Would be very helpful.

But what kind of forces are we talking about here? Be clear. Consider the lever practically massless.

Could you bring out those internal forces? Because I am not sure I follow. http://img6.imageshack.us/img6/8206/48580036.png http://img6.imageshack.us/img6/8206/48580036.png Though let's observe as the lever has no load anywhere on it. Let's just observe the point where the load is placed in...