Recent content by pyrexyn

It is not a evenly distributed weight, and not homogneous. However, we found some equations in a textbook that helped us. Thank you anyway.

There is a rectangular prism (L x W x H) = (72 x 36 x 8). The center of mass is 31 inches from one end lengthwise, and centered heightwise and widthwise. I drew an image: http://www.xdemi.com/hovcalc/delirium.bmp Basically, we need the moment of inertia of this object. Two forces are...

Suppose you have a tube made of nylon. It is filled with air. Obviously, the cross-section is a circle. Now, suppose that on the top and bottom of the tube, a length of rigid sheet metal is attached and does not permit curvature, so that the cross-section after inflation looks like this...

Update: Don't bother to answer the question that I pose above. My friend and I have done a lot more thinking and we've changed the problem significantly. All that we're stuck on now are calculus concepts that we haven't learned yet. Thank you for all the help you've provides so far...

Thank you for the compliment. Our group would not be this far without your help. I was actually trying the graph idea, but I couldn't get anywhere. It seemed this is dependent on that, and that is dependent on this. And it looped. For this entire post, pretend that there is no inner...

There is something that I really don't understand. And I think it's the cause of most of my problems. Inflation. What is the exact process that occurs during inflation? The tube is crumpled up into a seemingly random shape while deflated. Air enters the tube. And then what? Does the...

Thanks Artman, I'll think about that. I just have one simple question. 212 square inches of the 200 pound weight will be in contact with the tube. 2380 square inches of the 200 pound weight will be in contact with the middle. I want to calculate the psi in the tube and the psi in the...

Yes, I did know that the middle would be in our favor. About a week ago, I planned on figuring out the dynamics of just the tube, and then incorporating the middle. But upon your reminding me of this, I realize that I may not be able to do separate calculations on the middle and just subtract...

Yes, I definitely forgot about the pumping power of the leaf-blower. The website does not show specs on the "pump curve." However, other information is available at http://www.sears.com/sr/javasr/product.do?BV_UseBVCookie=Yes&vertical=LAWN&pid=07179734000&tab=spe&bidsite=CRAFT#tablink. Do you...

Thank you FredGarvin for all your help. It definitely makes us more confident about our calculations. Although I revisited all the concepts, the confirmation of my assumptions help. And thanks for the input, Cliff_J. I have not seen the show, but I'll take that into consideration. Here is...

Sorry, I think I'm doing this completely wrong. I realize that there is much more going on here than I thought, and I conceptualized the entire thing wrong. The input air raises pressure, which in turn forces air out. Two rates need to be combined, and I did not account for any of this...

Thanks again. But if you could help me just a little further, it would be great. The equation made sense and I have all the numerical values. However, I think there is a flaw in an assumption that I made previous to all this. I thought I might as well ask you... Imagine a long tube...

Thank you very much for all your help! I am still a little confused though. First, the Net Expansion Factor (variable Y). I have no idea what this refers to, but I can infer that some fluids have different compressive qualities than others. You seem to suggest that this factor is not...

In an engineering class, we are working in teams to build hovercrafts from scratch. My team is trying to derive all equations with our knowledge instead of looking them up at hovercraft hobbyists' websites, etc. We're only in high school, so our knowledge of physics, especially fluid physics...