Recent content by wannab

I've got a plastic bottle that I want to reuse for years, but the label said that you shouldn't reuse it for hygiene reasons. I'm assuming some bacteria builds up or something and this is dangerous? If so, what is the best way to kill these microorganisms without wearing down the plastic?

That would mean a few hundred pushups would be expending the same energy as a half-marathon (according to a running app of mine) ... that can't be true maybe I'm confusing calories with kcal or something. hmmfph.

I'm around 80kg and I go about 0.5m high. So the change in potential energy is 80*9.8*0.5 = 392 J Is that a reasonable estimate of the total minimum possible expended energy? Can you believe a few years ago I was on the second year of an undergraduate Physics degree!? It has completely...

Just wondering if any of you can do the calculation that well approximates the amount of joules expended by a push up.

50*24 hours

It needs to perform at least 50 cycles with a cumulative error of no more than [+\-] 30 minutes. This is for a home project. Any suggestions of components?

Most dogs would be running across continents and looking after their own litters, not running around gardens and fields looking after their plastic toys. Don't you think it's cruel to confine animals to such small living environments? We're essentially kidnapping them (and often...

Neuroscience then. They overlap somewhat.

Lol. Yes. There's more to that 12 second clip than ten minutes of people rambling on and being vain like YouTube is filled with. I know it's not stricly engineering though. Should I call it design? (i'm not going to just say toilet locks lol)

Do you agree with the description? I think the low numbers of women in engineering are purely cultural, nothing really to do with men being more logical than women or whatever. They say men have more logical brains, but I don't think they can know that tbh. Psychiatry is nowhere near being...

Do you mean voltage controlled variable resistors?

I just want to know what you think (in order of when you think it) when you look at this circuit. I'll post what I think. 1) without input: Current goes through R1 and TR1 which allows more current to flow through R3, R4, C2 and R5 and to TR2. The current through TR2 inhibits the current...

To the base or the collector? Would you be able to show me a circuit diagram where this oscillation occurs?

A transistor is capable of sending a radio signal? How does this work? How would I receive it?

What are the most basic components I need to generate and receive a radio signal and how would I arrange them? For instance imagine I want to make an LED in my bedroom flicker when my front door opens. Firstly how would I make this happen at the most basic level, so that some signal is...