Recent content by uradnky

Hah that makes things easy. I guess I was thinking back to statics where if I was assuming a member to be in tension, but my answer came out negative then I had assumed wrong and it was in compression. Thanks a lot.

Homework Statement While working through problems I always have trouble determining the direction that tension acts in on objects in the system. In system B.) block A has a velocity of 4m/s to the right, with mu(k)=0.2, causing the mass B to fall, in class tension was assumed to be in the...

R = 8.314 / Molecular Weight of helium

You can solve this using either the Relative Motion Method for mechanism analysis, or Instantaneous Centers of Rotation. I`m guessing you haven't covered either of these in your course, I did a quick search and found this book if you want to read up on it...

If you want me to go through the whole problem let me know.. But the problem with your solution is with Force B. Under your moment column for this force you have 5.65 x 0 = 0. This is incorrect. The VERTICAL moment of force B IS ZERO! Since the hozitonal distance from Fb to the pivot is...

I may be able to help a bit..I had a question simmilar to this, but I've handed it in. I made and used a spreadsheet to solve it, not calculus. With all of your given information, you can solve for the temperature of the fluid inside the pipe. (Is the thermal conductivity of the pipe...

It's been awhile since I've done this but hopefully I can help a little. I can't read your SFD too well, but to solve for the bending moment at D.. Take moments from point A Ma = 0 kn . mm Mb = 0 + (Length x Width on your SFD) The bending moment at D will be Mc + (Bound area from...

i have a quick question about stability..sorry if I am hijacking the thread.. If you are determining wether something will be stable or not, is it only dependent on wether the metacenter is above the center of gravity?

Homework Statement A roller coaster car has a mass of 800kg. It is released from the top of the hill A and moves without friction down the track. Determine the minimum exit velocity vD at ground level so that the car travels around both the circular loops (Loop B - Radius= 10m, Loop C -...

That was easy. Thanks.

Homework Statement Find the area bound by y= x - 2\sqrt{x} and y=0 The Attempt at a Solution X intercept = 4 Y intercept = 0 Using vertical rectangles.. dA = ((Upper curve)-(Lower curve)) dx \int(dA = \int(0-(x-2\sqrt{x})) dx A= -(1/2X^2)-((2x^(3/2))/(2/3)) Evaluated from...

Homework Statement In coming to a stop the acceleration of a car is given as a= -4t. If it is traveling at 32m/s when the brakes are applied, how far does is travel while stopping? The Attempt at a Solution 1.) Integrate acceleration to find velocity as a function of time v=...

Yeah, with 1st derivative test right? I just figured that it would be ok to assume a maximum because that's what the question asked for, and solving for r only gave me one value.

Thanks for confirming it for me. Plugging .8 into the derivative gives me 0 so i guess i was right all along.

Homework Statement The electric power in Watts produced is given by p= 144r/(r+.8)^2 where r is the resistance in ohms. For what value of r is the power P a maximum? Homework Equations The Attempt at a Solution Using the quotient rule i found a derivative of.. dp/dt= 144(-r+.8)...