Recent content by wahaj

So basically the problem lies in the uneven sample sizes, which is what I was worried about too when I made my original post. But as I found when I started working on the data; the weights are not an issue. All the samples I collected contained approximately 60 numbers each and there were only...

When I calculated the means of each sample, they were pretty close to each other. Close enough for me anyways; Standard deviation of the mean of means was about 10% of mean for set A and 6.5% for set B. I suspect that I if I took more samples in each set I could get even better standard...

This is probably the simplest way to go about doing this. Thanks for the help

I have two data sets A and B which correspond to two different settings of the system. Both sets contain 5 separate lists of integers; I took 5 samples, at different points in time and location, for each set to reduce the random error in the data. How would I go about comparing sets A and B? If...

Anyone know any good resources on airplane tails? I am looking for a tail shape that will work at low reynolds numbers for a small (model sized) cargo plane. I found quite a lot on wings when I was looking for a shape for that but not so much for tails. If anyone knows any good books that...

Sorry about the late reply I got caught up in something. Thank you for helping me out. The links you gave solved my problem

Thankyou for answering. I was thinking it would be ok to ignore shear but I just wanted someone elses opinion on the matter. You said that to do deflections I would have to analyze the beam as a whole. But what if I only wanted to find the deflection for the ends of the beam where the forces...

The situation I am looking at involves a round beam that goes through two rigid round holes (top beam in the image). The holes are meant to fix the beam. The beam length is between 1m and 2m and the diameter is less than 2 cm. If the beam was attached at the end with only one holes fixing it I...

Homework Statement If I have two spars running through an airfoil, which can be assumed to be two dimensional, which method would I use to find the stresses at the points where the spars are fixed? The loads would be lift and drag and what I need are the bending and shear stresses. Because I...

I had completely forgotten about that. That should solve my problem, thank you for helping.

I thought I could add them using vector addition. If I remember my Mohr's circle correctly, on the circle the maximum stress occurs when shear is 0 and max shear is when stress is 0. So after drawing the circle and finding the maximum stress and shear I look at them individually to see if either...

To makes things simple, consider a simple beam fixed at one end an a load applied at the other. This load will produce shear stress, bending stress, and torsional stress. When looking at yield at the fixed end, do I take the biggest stress of the three or do I add their magnitudes to see if it...

Thanks for clearing this up.

I didn't realize there was a difference but cylinders for this question.

After I have an expression for the stream-function in a problem, I can differentiate to get the tangential and radial velocities because I need those to solve the problem. But I don't understand when the tangential velocity will be 0 and when the radial is 0. Can some on explain?