Recent content by Roomie

Hi, my lecturer has given us two graphs showing the general shapes of the max torque curves for both gasoline and diesel engines, and they clearly show that the diesel engine has a much flatter torque curve than the gasoline engine, but not explained why. Expected to find this information...

Ah yes I see that I missed a squared, and that makes my answer 0.111. But I don't see how I have used the wrong mass? The mass of the semi circular disk is 10kg?

Homework Statement http://dl.dropbox.com/u/630750/Screen%20Shot%202012-04-26%20at%2010.03.36.png Homework Equations The Attempt at a Solution http://dl.dropbox.com/u/630750/Photo%2026-04-2012%2010%2001%2034.jpg I know this is wrong but I can't really see why, can anybody...

EDIT 2: I've sorted this now. Please Ignore.

Anyone?

EDIT: I meant to place this in Engineering help. Would a moderator please move it there? Thanks. Homework Statement I need to work out the theoretical principle second moment of area for an L shaped specimen I have...

I realize this was slightly confusing but this is what I mean: Here are 2 different Mohr's Circles, that cross the x-axis at different places just based on the scales. So which is correct? http://dl.dropbox.com/u/630750/Screen%20Shot%202012-01-04%20at%2021.48.12.png...

I'm just wondering about using a Mohr's Circle, do I need to use the same scale for the x and y axes, as surely otherwise my choice of scale greatly impacts the results. I am using one to get my principle second moment of areas, Ix and Iy, for an equal L section. Ix and Iy are where the...

Great! Thank you for your help, I will redo the working more accurately when I write it up properly. Thanks again.

I checked my dx and it was completely wrong, redid it and you're right Ix=Iy. I then tried to work out Ixy, I've never done this before for a shape where the axis isn't the center of the shape though so I may have done this completely wrong. Here is my working for Ixy, I would really...

Thanks, are they definitely supposed to be the same? As I have some experimental results that I need to compare these to and they are not the same. And later I have to construct a Mohr's circle with Ixy to converted these to principle second moments of inertia, that wouldn't work if Ix=Iy would...

Thanks for your help. Just spent a while studying how to find the centroid, and then redoing the moment of inertia. Hopefully this is correct. Would you mind please checking? Attempt 3: http://dl.dropbox.com/u/630750/attempt3.jpg Thanks!

Homework Statement I'm trying to work out the moment of inertia for this L shaped beam: http://dl.dropbox.com/u/630750/Screen%20Shot%202011-12-31%20at%2017.54.34.png Homework Equations (Included on my sheets below( The Attempt at a Solution I've made two attempts, the first...

It isn't something I've done a considerable amount of work on, I'm used to using the formulas for common shapes such as beams & cylinders. But looking through my textbook I've found some examples. They demonstrate using Ix and Iy, but they're Ia and Ib in my problem I think. They...

Thanks for the reply, I just don't know how to calculate IA, IB or IAB. Is there a formula I should know?