Recent content by question dude

Do I treat the non-bold r as a constant? If sub in bold r, I get: G = [(x^2 + y^2 + z^2)^0.5 ] / 4*pi*r^3

Homework Statement Homework EquationsThe Attempt at a Solution As you can see, the solution is shown just below the question. Essentially, I don't understand how the x, y and z component of the vector field has been separated because the numerator of the vector field's fraction is: (x^2 +...

How is the expected frequency column worked out for each interval of trains? 2) My attempt Take the first interval, 60 - 62, I thought about doing this: (62 - mean) / standard deviation (62 - 67.45) / 2.92 = - 1.866 using Z score < - 1.886, from the normal distribution table, I get: 1 -...

The framework is attached below. I've tried going to each joint and resolving the forces vertically and horizontally. I've got to joint B and I'm stuck, because I have three unknown members there. And its the same if I go to joint J. what do I do?

'head' is simply stress (or pressure) mulitplied by depth for total head is the total pressure as it were

Its attached below. I don't understand how you work out the total head. Can someone explain how you do it? I'm really struggling. I know how to do the elevation, which is just the height above/below the datum level. And I've checked the solutions as well, it seems like you're supposed to work...

Theres no rebuilding, I've built the thing, and now I've got to analyze it as it is (terrible situation I admit). The whole structure is supported at its two ends. One is shown on left of my diagram, hence there is a 4KN arrow, and the other is the right hand side of the structure which isn't...

This is actually half pf a complete structure (which I have designed and built), so I have omitted the rest of the right hand part in my diagram, but let's assume that we know the forces in the other members (caused by the applied loads). What I want to ask is, whether there's a way to work out...

Homework Statement I want to find the force in the vertical purple member. Assuming I know the forces in all the other members, there's a problem with working out the force in the purple member. (Bear in mind, I'm using the method where I assume equilibrium at each joint in the...

Sorry about that, what I meant to get across, was that I understood the method in a sort of algorithmic way, but didn't understood the reason behind steps due to not understanding some basic stuff like 'level curve'. Anyway its sorted now.

Thanks a lot! I understand what's going on now. Before I was just plugging in the numbers without knowing the concepts properly.

I've done the first part, but I'm stuck on the second paragraph of the question. Maybe I'm being stupid, I don't even understand exactly what is meant by, 'the level curve'. I also don't quite understand the whole concept of directional derivative. When it says, 'the gradient in the...

the matrix I posted in the pic inb my 1st post was for matrix A, not (A - I*lamda) I've done what you've suggested, by writing down A - I*lamda, its basically the same as matrix A, except for the three values in the central diagonal, they each have '- lamda' I'm trying to calculate the...

seems like a decent method, never come across it before though is there any significance to the values next to each of 'a' in the matrix shown in your first link?

but there's two values in row 3 that I need to get to zero I can't make a subtraction that would get them both to zero, because they're not the same values sorry I can't see why