Recent content by javaistheman

Update: I just discovered the Matlab extension "dfield." I added the function into matlab, ran it, added it to the current path. I still don't know the format of entry though. For example, I typed dfield8(y'=-t(y^2-0.5y-0.5)) and it obviously gave an error. Where does the equation get plugged...

Homework Statement Plot the direction field of y' = −t(y 2 − .5y − .5) for t=[0,5] and y=[-2,2]. Plot a line every 0.25 units in t and y. The length of each line should be 0.1. Hint: Use line(). Look at the picture to determine the starting and ending coordinates of each line. Homework...

Ha! I knew there was a basic rule that I didn't know. Thanks a lot. I also see now that the centroid of that quadrant has it's own formula too.

What do you mean? For the bottom left piece for example, the width is 20 so I divide that in half to get 10 for the distance. How do I find the dimensions of the top left and bottom right pieces. For the semi circle I can do ([pi*30^2]/2). Then 40*20 to get the bottom left piece. Then I'm left...

Homework Statement Find lx and ly. The Attempt at a Solution So after countless studying of this topic, and no notes from my professor to help, I thought I had the process figured out. But this initial image is throwing me off a bit. Here's what I believe to be the right process for these...

Really? I thought it went like this: I divided out those scalars to get this: 0.436i - 0.873j - 0.218k. Then I multiplied each of those by 800 to get the components of C: Cx= 348.8, Cy= 698.4, Cz= 174.4 Then I used the dot product formula to find the moments: Since rCA = 4i+5k, Mcx for example...

Alright so I now see that the 21 came from squaring each of the 3 units vectors and adding them. When I was talking about the components of C, I meant Cx, Cy, and Cz. Which I guess is the force at point C in each direction. So basically they multiplied the 800 lb force by the scalars to get...

I'm currently reviewing for a final tomorrow, I need to score a B on the final to stay in school. I'm beginning to panic as I've reviewed all day and have gotten nowhere. 1. Homework Statement The tension in the cable AB is 800 lb. Determine the reactions at the fixed support C. The Attempt...