Recent content by enc08

Thank you andrewkirk.

I have clarified the question.

Thanks, I have clarified the question.

Homework Statement Hi, A question on work done in inflating a square balloon. Homework Equations Work done = integral of p*dv (see below). The Attempt at a Solution I just wanted some pointers on the following. Work done = integral of p*dv. But I don't know if p0 would be taken into...

Hi, I don't get the right answer for this question. I don't see where I'm going wrong. I use this equation to get the engine rpm for each gear ratio: engine speed (rpm) = gear ratio X final drive ratio X vehicle speed X 60 / (2*pi*rolling radius) So for first gear I get an engine rpm of...

I see, I had misread your question and looked at another part (you're right regarding the above). For the pressure equation, I got rid of the derivative with respect to r by saying that grad(p) is a body force, and the scattered pressure is therefore r * grad(p), so that the scattered pressure...

Thanks for noting that. Re momentum conservation: I make the assumption that the fluid in which the sphere sits is incompressible, so the partial derivative of velocity wrt radius becomes zero. That's how my momentum equation simplifies. Thanks

Thanks. So I've tried to proceed starting from the momentum and continuity equations, and I get quite a close answer, but missing two things as explained below (I did it in an online Latex editor hence it's an image).

Hi, Attached is the equation relating the vibration of a sphere radius R, to the pressure field it generates. ρ is the density of the medium in which the sphere sits. The article I got this from just states the equation - I haven't been able to find anywhere that derives this equation...

I would assume there's a simple trigonometric identity to apply. What makes this difficult for me is that phi is present in both the x and y directions, whilst the equation somehow describes it through the x-axis.

Hi, The attachment below is about strain rate in fluids*. It shows how the strain rate d\phi/dt is related to the velocity field derivative du/dx when you stretch the element in x (i.e. longitudinal strain). It has no intermediate steps, and I can't see how the angle has been related to...

Hi, I'm trying to understand the mass conservation equation for a pulsating sphere which has thickness dr. Please refer to the attached solution. \rho = \rho_{0} (ambient density) + \rho' (small deviation) There are two things I don't follow. First, is that to obtain the mass, the area of...

I see. From what I understand, 'evolves' means that it turns into gas?

Hi Borek I'm beginning to see how it's correct...that the ammonia dissociates in water so it can react. Could you please describe what the correct equation is? We haven't looked at conjugate bases, could you elaborate? Thanks.

Hi, I'm looking at a question which asks how one can test for ammonia in [NH4]2Fe[SO4]2 The answer says that you add sodium hydroxide, and get [NH4]2Fe[SO4]2 + 2 NaOH -> [NH4]2Fe(OH)2 + 2 NaSO4 This is what I don't get: it then says you test the ammonia gas with litmus paper, or with HCL...