1. ### Effect of Strain Hardening on Yield Strength

Homework Statement The strain hardening behavior of an annealed, low‐carbon steel is σ = 100,000ε0.2 If a bar of this material is initially cold worked 20%, followed by additional cold work of 30%, determine the probable yield strength of the final bar. Homework Equations σ=κεη...
2. ### FBDs and Tension

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 alot.
3. ### FBDs and Tension

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...
4. ### Simple Thermodynamics

R = 8.314 / Molecular Weight of helium
5. ### Statics hw problem

You can solve this using either the Relative Motion Method for mechanism analysis, or Instantaneous Centers of Rotation. I`m guessing you havent covered either of these in your course, I did a quick search and found this book if you want to read up on it...
6. ### Help On Moments

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...
7. ### Heat Transfer question.

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...
8. ### Heat Transfer

Homework Statement An electrical wire 1/8" in diameter is covered with insulation 3/32" thick. Six watss of electrical energy are dissipated as heat by the resistance of the wire per foot length. The heat is given up to the surrounding air at 60 degrees farneheit. Estimate the outside...
9. ### Shear force and bending moment diagrams

It's been awhile since Ive 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...
10. ### Fluid mechanics involving stability

i have a quick question about stability..sorry if im hijacking the thread.. If you are determining wether something will be stable or not, is it only dependant on wether the metacenter is above the center of gravity?
11. ### Fluid Mechanics - Distance to Centroid

Homework Statement http://i284.photobucket.com/albums/ll12/uradnky/fluid.jpg I'm asked to solve for the force on the projected plane surface and show where it is acting. This problem seems pretty easy, but with the dimensions given I can't find Lc, so I cant find dc to begin it. Is...
12. ### Conservation of Energy - Roller Coaster

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 -...
13. ### Area under curve

That was easy. Thanks.
14. ### Area under curve

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 verticle 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...
15. ### Applications of Integrals

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=...