Thank-you for the response.
1) Yes, the beam is accelerating. It will be part of a machine that will apply a maximum of 3.5 lbs-f upwards on both ends of the beam.
2) Thank-you
3) My intention was to design it to the maximum allowable stress and then simply double the dimensions of the beam...
I am trying to find the width of a square hollow structural member that can withstand the forces above. However, my calculations are showing me that a square hollow aluminum tube of 4 mm by 4 mm with a wall thickness of 1/16 of an inch would be adequate, which I don't believe.
Is anyone able...
I think what the question is asking, is that 3 random numbers are chosen FROM a standard normal distribution. It's then asking what the chances are that their sum is less than 2.
Homework Statement
3 randomly selected observations form the standard normal distribution are selected. What is the probability that their sum is less than 2?
Homework Equations
The Attempt at a Solution
I know that the answer is 0.874928, but I don't know how to get that...
Homework Statement
The problem is to solve:
y''+ty'+e^{t}y=0, y(0)=0 and y'(0)=-1
Homework Equations
The Attempt at a Solution
My main issue is the following: I normally find the recursion relation, and then factor out the t^{whatever} and I know that the coefficient to this...
Homework Statement
A submarine maintains 100 kPa inside it and dives 250 m down in the ocean having an average density of 1030 kg/m^{3}. What is the pressure difference between the inside and the outside of the submarine in kPa?Homework Equations
The Attempt at a Solution
I am quite confused...
OK, thank you to both of you. It is starting to clear up quite a bit now.
I forgot that a battery can charge by charge flowing into the positive terminal. Also, it is clear that the -2V should be 2V.
I should be able to solve the problem from here on.
Thanks once again
OK, thank you for the help.
I am still quite confused though. I understand how b and c aren't connected, implying that there is no current traveling between them. I also understand that despite how they aren't connected, there will be a voltage difference between them.
I'm still very...
Homework Statement
Find V_{1}, V_{ad}, V_{bc}, and (V_{ac}+V_{ce}) for the following circuit:
Homework Equations
The Attempt at a Solution
I am having a hard time with this problem.
What I know is: V=IR
The current going into a node is the same as the current coming out...
Homework Statement
Under which class of materials would the following materials be categorized?
What are/is the primary bond type(s) in each material/object?
a. Tennis Ball
Homework Equations
The Attempt at a Solution
We'll consider a very simple and standard tennis ball...
Thank-you. I will be able to solve it from here on.
My biggest issue was in realizing that \frac{u+v}{u-v}=\frac{1+\frac{v}{u}}{1-\frac{v}{u}}
After this I rearranged to
\frac{du}{u}=\frac{1-g}{1+g^{2}}dg
I should be able to solve this using techniques of integration.
Thank-you...
OK, I have tried this already. I still get stuck however.
g=\frac{v}{u}
v=gu
\frac{dv}{du}=u\frac{dg}{du}+g
so when you sub this into \frac{dv}{du}=\frac{u+v}{u-v} you get
u\frac{dg}{du}+g=\frac{\frac{v}{g}+gu}{\frac{v}{g}-gu}
And I'm still stuck. This seemed even more...
Thank you for the help, but I solved my problem. It was simply a matter of not taking the time to read the titles and assuming that the sub forums haven't changed in the past months even though they have.
Homework Statement
Solve (x+y-1)dx+(y-x-5)dy=0
Homework Equations
The Attempt at a Solution
x=u+h
y=v+k
Therefore
h=-2 and k=3
Therefore
(u+v)du+(v-u)dv=0
\frac{dv}{du}=\frac{u+v}{u-v}
This is where I'm stuck. I can't solve the equation above. I have a...
Can't post in pre-calc? [SOLVED]
I can't post in the pre-calc subforum. I haven't been on physics forums for some time so maybe I have been automatically disabled. Can someone please help me to solve this?
EDIT:
Wow it's been a while since I've been here and things have changed a lot...