Recent content by kaffekjele

I was looking at that and tried to find the new temperature by using T2= T1*(\frac{V1}{V2})\gamma-1 which gave me 221,46K which is not correct according to my lecturer.

Homework Statement You are given a closed container containing a single atom ideal gas. The volume is V1= 0,45*10^(-3) m^3 Pressure p1 is 3,2 MPa Temperature, T1, is 892 K The volume of the gas is increased to V2= 8*V1 Find the pressure and temperature after the increase of volume...

My bad, the answer would be for radius, r, so the diameter would be 2*r which would be 0,051. As for units, if the answer above is correct, the only thing that makes sense is that it's in meters, thereby giving a diameter of 5,1cm. (But, units, exponents etc. is something i really have to...

Homework Statement You have a round steel cable with diameter d and a ultimate strenght of 400Mpa. There is a force of 8,2KN working along the cable. What is the smallest possible diameter the cable can have without breaking? Homework Equations δ= N/A Area of a circle: πr^2 The...

Could someone please help me make this expression a little smaller? I'm sure there are things that cancels out or could be re written, but I generally suck at these things as I tend to break a few math rules along the way. Could I for instance cancel n against n in the two last cosine...

The two F/2 cancel each other out regardless of whether you do the moment calculations clockwise or counter clockwise?

Perhaps a stupid question, but is that based on the fact that sum of forces and moment should always be 0? (I'm doing physics for the first time in 14 years, so I fear a lot of what I learned in high school might have been forgotten.)

Yes, I was thinking about that.But if I did add x and y force in C and D I assume the correct thing to do would be to start by looking at the truss as a whole and do moment and force calculations around one of the joints? Should I start in A or C?

Homework Statement Original figure is here: http://tinypic.com/r/svrm39/6. The task is to calculate forces in N1, N2 and N5 with the correct sign.(+ or -) The Attempt at a Solution Figures and calculations attached. I fear it might be messy - especially when it comes to use of...

That's one of the things where I'm not sure if it's done correctly, but what I did was add 2,2 and 1,4. I suppose the height has to come into play somewhere, but I'm not sure how. Up until now I've only been doing calculations on regular beams without any sort of "protrusion".(Sorry, I don't...

I've done the forces and moment calculations on the beam, but I'm a bit unsure if it's done correctly. Every force is working on the center lines according to the figure, so I might be missing something here. I'd appreciate it if someone could take a look at my calculations and perhaps give some...

Calculate forces on beam with "hook" I have a beam which looks roughly like the attached file. The aim is to calculate forces in A and B. Would I have to look at AB and CDE independently, or could I proceed as "usual" by calculating the moment in A and proceed with forces calculation in x and y...

It's not parallell to the orignial BD, no. I moved it because I didn't see any other way to complete the triangle without having to move some of the other forces as well. I looked at an example in my coursebook and it seemed this was an ok thing to do, but I might have gone about it the wrong...

Homework Statement A beam ABC is fastened in C and is supported by the axially loaded bar BD. There is a load F working in A. Disregard any friction. Use the given measurements to find the force in the axially loaded bar BD, the force in C and the angle of the force in C by means of...

Thank you so much for your help. I appreciate it.