Recent content by DEvens

For questions 1 and 2, yes they will radiate. For 3, the definition of "significant" is required. I used an online calculator for this. The amount of heat radiated strongly depends on the surface finish. If it was highly polished, at 30C, it could be as little as 36 Watts per square meter. If...

You can buy a chiller for a cold plunge for under $500. Several models on Amazon. Delivered in a couple days and easy to set up. No messing around with vacuum pumps. And, at a guess, I'd expect it to use a lot less electricity than a vacuum pump for chilling water. Considering you need at...

When you are doing collisions, the easy way is almost always to go to the centre of momentum (COM) frame. This frame has total momentum zero. And this is true after the collision. So when it's an elastic collision the momentum (in the COM frame) of each mass simply changes to the negative of the...

You are going to need some very strong door posts. And the arch across the top is going to need to be very solid as well. They have to support the weight of these doors hanging from the hinges. The hinges are going to need to be pretty strong also. You are going to want some clever method of...

OK, I don't really understand some of your post. What do you mean by "a much better matching in the heat exchanger between the 2 fluids"? And what is a "pinch point"? And what does it mean that it's 9K? Anyway. I'm guessing you have some sort of solar collector as the heat source to heat your...

It has been covered fairly well already. But a few things missing. You want calculus up to partial differential equations. A class in solving those would help but isn't required at the very start. You probably won't be solving anything but the simplest of differential equations in your first QM...

First: Do not neglect your communication skills, your interpersonal skills. It is exceedingly unlikely you will be the only person working on a topic. You are most probably going to need to talk to people about your work. In academe you need to publish, you need to give talks to audiences, you...

My problem with Cox is that during any talk he gives you can pretty much count on him turning to the audience and confidently proclaiming that he has just proved the only solution is for you to give more money and power to the govt. Climate change? More money and power to the govt. Eduacation...

IQ tests are not perfect, but don't need to be. A test of "puzzle solving" sort of intelligence, if well constructed, will have a good correlation with success in physics. "Perfect" would mean that every person who scored high on the test became a physicist, and nobody who scored low ever did...

I wonder what you mean by "without any observation." What changes to the standard situation are you contemplating to have a situation "without any observation?"

Just curious. Is the goal to calculate the physics behind the system? Or to do a "Hollywood" and make something the looks like the panel? Even the Hollywood would be quite a task to get accurately. Many of the lights and indicators would only happen in specific combos or sequences. This...

Probably you are better off to use the fractions until the very end. Solving your first equation gives this. ## r = \frac{2}{3} s = \frac{6}{9} s ## Your second gives this. ## j = \frac{8}{9} s ## Putting that in your third is this. ##s+\frac{6}{9} s+\frac{8}{9} s= \frac{23}{9} s =...

Great Britain is the island (well, large island plus some much smaller islands) including England, Scotland, and Wales. That is, it is the geographic region. The sovereign nation is The United Kingdom. Or, more completely, The United Kingdom of Great Britain and Northern Ireland. And often...

A year old post. Probably not going to be useful to respond, but in case. There are some projects to import CAD drawings to MCNP, but they seem to have gotten lost. The latest version of MCNP supposedly has some CAD ability but I cannot report directly. My last use of MCNP was 6.1. If you...

OK, a year old post with no answer. Probably it is too late to do anybody any good. PTRAC files can be text or binary depending on the options you choose. Check the manual entry for the card that produces the PTRAC file. The message you quote says "binary file" so probably you have chosen the...