# Recent content by bortonj88

1. ### Integral help

thats the problem, i couldnt figure out how to do the integral on the left hand side, so I used quickmath. If you have a suggestion please let me know, as this isnt homework, my housemate gave it to me to try and solve and now its really bugging me! As for the constant, inital conditions are...
2. ### Integral help

sorry, meant to read \Rightarrow ln({gm -cv}) = \frac{1}{m}t
3. ### Integral help

\Rightarrow \frac{dv}{gm -cv} = \frac{1}{m}dt Yeah i had this, i then integrated to get \Rightarrow ln{gm -cv} = \frac{1}{m}t
4. ### Integral help

yeah, sorry, i made a mistake with that. It was meant to read; \int(1/(g-(c/m)v)) dv = \intdt Thanks JB
5. ### Integral help

Hi everyone I am looking at integrating this function, \frac{dv}{dt}=g-\frac{c}{m}v So far i have rearranged the function to get, (\int1/g - \int1/(cv/m))* dv= \intdt Thanks JB
6. ### Fully developing pipe flow

Hi As fluid enters a pipe and progresses further down, does the shear stress at the wall reduce whilst the boundary layer increases and viscous forces take over? Thanks
7. ### Not sure what subject this comes under, and not HW, just a problem.

Homework Statement A plane travelling a distance of 660km, with unknown speed, has a tail wind of 60km/h, and due to this tail wind arrives at its destination 6 mins early. What is the speed of the plane without the wind? Homework Equations I have so far used s=d/t, The Attempt at...
8. ### Proving a 2D slider crank mechanism fits the Gruebler's Equation

Homework Statement Need to prove that a slider crank mechanism fits the Grueblers eqaution, already done for a four bar mechanism no problem, however having some serious problems with the slider crank. If l is the number of links and j is the number of joints Homework Equations Grueblers...
9. ### Brayton Cycle

When looking at a brayton cycle, how do you find enthalpies when your only given temperatures? This is not a homework question, just reading through the textbook and cannot see where got the value from? Thanks
10. ### Compressive Flow Experiment

I didn't mention that the nozzle a converging- diverging nozzle. Also I know that at the throat of the nozzle the fluid cannot reach speeds above Mach 1, sonic speeds. However i am wondering where on the graph this relates too.\ I also know that the Pc/Po(critical pressure ratio) for air is...
11. ### Compressive Flow Experiment

Homework Statement Wondering if anyone could give me a hand, I have created the attached graph. It shows the variations of pressure in the nozzle for different supply pressures and back pressures, in the form, P/Po vs position of the nozzle. and not too sure what its showing Homework...
12. ### Calculating Stress (AISC)

thanks mathmate. I was wondering if anyone could shine some light of a problem myself..... why use all the different methods of stress analysis, standard failure stress, Euler Stress, Rankine Failure Stress, Perry Robertson equation stress, and the AISC rules?? Thanks John
13. ### Calculating Stress (AISC)

Alright Couchy. i sorted it out. ill send you it if you want it. turns out like a treat!! :D:D:D:D And thanks to everyone in this thread, all replies really helpful. :) Also mathmate, what program were using to draw those graphs, i think it may come in handy? John
14. ### Two Carnot Engines working in Series Problem

thanks but i was actually hoping someone would be able to point me in the right direction to get started.........
15. ### Two Carnot Engines working in Series Problem

I was wondering if anyone would be able to help with this question; Two carnot engines operate in series between a source 800K and a sink of 290K. The first engine rejects 400kJ to the second engine. If both engines have the same efficiency, calculate; (i) the temperature for the source of...