Recent content by skyturnred

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...

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...

Thanks! That simplifies things a lot.

Homework Statement Find the points nearest and furthest from the origin on the intersection of a plane with a paraboloid. Plane: x+y+2z=30 Paraboloid: z=x^{2}+y^{2} Homework Equations The Attempt at a Solution Obviously the first step is to find the equation of the...