Recent content by GBA13

Thanks once again, @Dr. Courtney, this has been really useful. One final thing I am just wondering about: when someone is deafened by a gun shot or explosion, is it the sound wave or the explosive blast wave that actually damages the ear? As someone can loose hearing from long term exposure...

Hi @Dr. Courtney, Thank you for that insight, that's really interesting. Do you know of somewhere more I could read more about the net momentum transfer in gun shots? Also, you mention the distance from the source as being clearly important. For typical gun shot would you be able to give a guess...

Okay thank you, I understand what you're saying. It seems like my hope to be able to simply apply a force seems like a no go (it came out of the idea that sound can be measured in Pa or N/m2, so a force could be extracted). Moving away from physical simulations, are there any computer simulation...

Thank you for your response, berkeman. I see what you're saying. Is it not at all appropriate to consider a sound wave to act on a object like a compressed air pulse would? I was hoping to be able to simulate the effect of a gunshot-type noise by exerting a force to the object but does that just...

Hello, I am going to be doing a project in which I'll be looking at how sound waves change the shape of an object. Specifically how sound waves can compress something. My question is, can I approximate a sound wave as a force in this case? I know a sound wave is much more complicated than a...

Hi guys, I know the difference between these two things but I'm struggling with something that I hope someone could help me with. What dictates the water pressure needed for a "system" to work? I would imagine that if you've calculated your system to have a pressure drop of 1 bar (for...

Hi Nidum, Thanks for your reply! That's very helpful. For the 3D printing of patterns, would that not give a fairly poor surface finish which would need to be smoothed before casting? Also what sort of materials are used in printing? Do people print patterns in wax? Thanks very much

Hi guys, I am learning about investment casting at the moment and have a question I would love someone to answer. In investment casting a wax pattern needs to be created. How would that be made for a complex shape like an impeller? I've heard that lots of impellers are created using...

Hi guys, I was just thinking about something and I'd love to get your opinion. How much energy do you think is lost from water pipes getting hot and releasing that energy into the air? In a three bedroom house there are probably a lot of hot pipes releasing heat energy. Do you think some sort...

Homework Statement Hi Guys, I know that, when measuring strain using gauges, using a full wheatstone bridge over a half bridge will give you double the sensitivity (Vout = NEGS/4, with N=2 for half and N=4 for full). But why would you use a hald bridge over a full one? What are the advantages...

Homework Statement Hi, I am thinking about a stretched spring with a mass on it. When the spring is fully extended and has just started to pull the mass back towards the equilibrium point, is the work positive or negative? Homework EquationsThe Attempt at a Solution [/B] I think as the...

The tension is 50N so then F = T, as it is for all the options here. Does that mean that F always = T?

Homework Statement Hi Guys, I am looking at a simple movable pulley system like the one two in from the left. I am trying to work out the relationship between the force applied to the free end (called F2 in the picture) and the tension in the cable Homework EquationsThe Attempt at a Solution...

I've looked at that but I can't find the answer. Is it there but I'm just missing it?

Homework Statement Hi Guys, I have found that as flow rate increases the pressure difference in the sections of the venturi increases. Would someone please mind explaining in words why as I'm not sure. Homework EquationsThe Attempt at a Solution Well I know that when the fluid gets to a...