What is a restraint joint in pipes?
Planes do have small cameras now. Gulfstream 450 and 550's have 7 external cameras counting the flir (forward looking infrared) on the nose. many new airliners are being build with cameras now too The reason most older planes don't have cameras is not because the camera was too big, but because there was no good way to get the information to the pilots. cockpits use every last bit of available space, adding a dedicated monitor was just out of the question. Now there is the technology to use an mfd (multi function display) to display external cameras, then flip the screen to other information, like changing windows on your computer.
As long as you clean the inside of the fittings, the outside of the pipe ends, apply flux liberally, and heat the fitting till the solder flows into the crack, you'll have a good water proof joint. If it needs to be handled soon after installation then you can cool it with a wet towel, otherwise it doesn't hurt it to just set and cool by itself. Solder should be lead free and solid, not acid core.
Absolutely that second surface will heat up if it absorbs those reflected photons. The amount that surface, or any surface, heats up depends on how much of the incident light is absorbed versus how much is reflected. And this depends on the material in the surface of the body. A mirror will reflect most of the light; so only a bit of it gets absorbed. But that's usually enough to raise the mirror's temperature a tad. And of course the intensity of the light, the number of photons per time hitting the surface also folds into the heating equation. That results because more atoms get excited for the same light when it's brighter, more intense. Bottom line, the non reflecting surface will heat up more for the same incident light.
