Recent content by yrjosmiel

So far, after taking into account the contraction of the distance of the light source and the wall, I concluded that there is indeed no difference in where the laser dot will land on the wall. If I do have any remaining questions: should I do an experiment to confirm this conclusion or would...

Sorry: the "original" is when the mirror is not moving. The "final" is when the mirror is moving.

I've done some solving and I'm not sure if I'm right, but here's what I got anyway: let θo be the original angle of reflection (with respect to the perpendicular of the surface of the mirror) θf be the final angle of reflection Lo be the original distance (just in the x axis) from the light...

I don't recall mirrors moving at subluminal speeds being part of my "everyday observations".

The point is still the same because the distance between the light source and the wall changed too, right?

Hmmm. I was expecting for the reflected dot to actually go up due to special relativity. Length contraction was what I had in mind. Let's say that the angle of reflection is θ. In this case, let's also say θ = 45° (this is with respect to the line perpendicular to the surface of the mirror)...

I thought this meant that the reflected dot will gradually go up.

That's if the mirror is accelerating to subluminal speeds, right? If the mirror was moving at subluminal speeds from the very beginning, it will stay fixed, but at least still higher than when the mirror is stagnant, right? Has anyone done an experiment on this? Would it be worth doing an...

Let's say I have an apparatus that's set up like this Let's also say that the mirror is infinitely long. If the mirror starts moving at subluminal speeds in the x axis, what would happen to the path of the ray of light? Would the dot made by the ray of light on the wall go up?

oh my goodness why did i not think of searching for a calculator Will do! Assuming that I don't die in the process, hopefully! Sure, but I'm a poor high school sophomore. Where would I even get the helium in large quantities?

I have read about a resistojet that produces around 0.2N of thrust for 500 W: source Also, is it possible that I would need cooling for the nozzle itself or are the temperatures low enough to not be a problem? Does the heating element ever need cooling in any kind of resistojet? a Also, how...

And what level of thrust should be expected from rockets, exactly? A resistojet rocket's typical thrust range is around 10-2 to 10 N.

Why so? Or are you saying that because it is technically not a "rocket" vehicle since we are just referring to the engine itself? Also, I've been thinking of measuring the exhaust velocity of the jets with some anemometers. The max rotational speed of the anemometer during the testing should be...

Heh, that's not a thing here. Perhaps another heating coil in the tubes to pre-heat it before going in the chamber would be a decent substitute?

What made you specially mention peristaltic pumps? Also, would gear pumps be acceptable?