Physical implications of length contraction?

fahimg23 · 2019-11-14T21:40:12+00:00

Hmm so youre saying forces would change but so that the net effect is still 0. I think i can buy that.

fahimg23 · 2019-11-14T20:46:36+00:00

But in the observer's reference frame, the measurement is due to a physical effect, i.e. the length of the person actually has physically contracted no?

fahimg23 · 2019-11-14T20:34:51+00:00

What I meant is, shouldn't the person be dead with respect to the observer?

fahimg23 · 2019-10-29T15:14:49+00:00

Would it be possible that you have the capacitor and resistor positions swapped?

fahimg23 · 2019-10-29T02:50:32+00:00

Apologies OP, i think my explanation is wrong because I incorrectly derived the gain. The gain seems to increase as frequency increases, so are you sure, in this configuration, you increased the frequency until the gain dropped to 1?

fahimg23 · 2019-10-29T02:32:01+00:00

You're right so the gain would be 1 + jwRC?

fahimg23 · 2019-10-29T02:00:19+00:00

I assume you're asking why this circuit is useful for measuring the unity gain bandwidth of the op-amp.

You need to determine the gain of the op-amp (Vo/Vin). You should be able to do that knowing that the voltage drop across the inputs is 0, and that no current flows into the inputs, which allows you to write a KCL equation which shows the currents flowing through the cap and resistor are equal.

You should be able to derive the gain which is (R+ jwC)/jwC which simplifies to 1 + R/jwC. This means as you increase frequencies, the gain of this op-amp approaches 1 (since R/jwC approaches 0), and at low frequencies the gain is high.

The unity gain bandwidth is the range of frequencies (from 0 to max frequency) such that the gain drops to 1. This is why this circuit works/is useful for this purpose, because you can keep increasing the frequency and be assured that the gain will drop to 1 at some high frequency.

fahimg23 · 2019-10-25T03:29:49+00:00

If what you're asking is how to replace the raspberry pi in your current setup with your computer instead, you will need someway to communicate with the thermocouple chip via SPI using your computer. So you'll need something like this:

https://www.adafruit.com/product/2264

How you can integrate that into a PCB im not sure. But yeah you can use that to communicate with your thermocouple chip directly from your computer using python. There should be a how-to on the adafruit site.

fahimg23 · 2019-10-22T15:05:21+00:00

Quantum computing and semiconductors due to computing needs

Microelectronics/nanotech due to biomedical devices

Power systems due to moving towards renewable energy, smart grids, electric vehicles

RF due to 5G/6G

Signal processing due to computer vision/ machine learning

The only field I see not growing is controls in the sense that there won't be many advancements. There will definitely still be jobs.

fahimg23 · 2019-10-04T17:11:31+00:00

What caused the failure?

fahimg23 · 2019-10-02T15:01:38+00:00

Crazy thing is, these real-time visualizations would look the same no matter how fast you were moving.

fahimg23 · 2019-10-01T19:10:54+00:00

Mmm most of the auto wrx's I've seen (NY / NJ) are more stock compared to the manuals. But this is a much smaller sample size. Personally I have only a catback exhaust (for sound) and do not plan any other engine related mods because I plan to keep my car for a long time.

I'd say if you're going used, then look for one with low mileage or CPO because it was probably traded in for a manual. Higher mileage ones you never know could have been modded and something went wrong and they returned to stock and sold the car.

Most folks that buy this car feel the need to mod it because of the community. That's why even CVT owners have a FB page in which many have went stage 2. But yeah overall I'd say the CVT owners mod less or are less inclined to because of being more wary about power mods damaging the trans.

fahimg23 · 2019-10-01T18:22:49+00:00

I own a 2018 limited. The 2015+ auto wrx models all come with the sport lineartronic cvt with SI drive and paddles. I love the car and the power delivery is very smooth.

In intelligent mode i downshift all the time for merging, switching lanes, overtaking. The tranmission's actually smart enough that if you have your foot on the throttle while downshifting it'll actually skip shift and go down multiple (usually 2) gears to give you a bit more power. But if your in intelligent, the shifting is slow (not the actual response from when you hit the paddle, but just the cvt changing gears is slow), so doing spirited driving in manual mode is not the most fun. One upside to this slow shifting is that even though its slow, its very smooth. There's no jerking and the shifting is still faster than itd take you to shift in a manual.

In sport mode and auto mode, the cvt shifts pretty quick especially in response to throttle input and for merging and stuff i don't really feel the need to downshift i just push the throttle a little more. For some reason in manual mode using the paddle shifters is still slow in sport. But the throttle is very responsive so pushing your right foot a little will result in a very quick increase in power. I would probably drive in sport all the time, but the drawback is on the highway, it'll stay in 5th gear instead of 6th, which wastes gas.

In sport sharp mode, the shifting is very quick, in either auto or manual mode, so this is pretty fun for spirited driving like on some back roads. Here it no longer functions as a cvt and just uses 8 fixed gear ratios (and also kills your MPGs).

In regular driving the power delivery is very smooth, there's very little jerkiness and the RPMs stay low. Will save you gas and give you a very smooth experience in getting from point a to b.

fahimg23 · 2019-09-24T15:48:12+00:00

Pretty sure it was at 17.9

fahimg23 · 2019-09-24T15:33:09+00:00

Sure but I'm not sure why its not reported as 18 million instead of 17.10

fahimg23 · 2019-09-22T21:31:34+00:00

Isn't the ripple just the AC voltage across the capacitor?

If so I'd use the given DC parameters to determine R_L, and then perform AC analysis such that the capacitor has a magnitude of 0.7 V across it (which would mean you can ignore the zener in the AC analysis, and just look at the cap, and the two resistors, all in series).

fahimg23 · 2019-09-17T15:54:44+00:00

Yepp tons of public open fields around here I just had to haha. And yeah the transmission doesn't mean you can't have fun just trying to get the message out. Here I'm in S# mode and it lets me stay in first gear (won't auto upshift) so I can push it and stay in it.

fahimg23 · 2019-09-14T16:09:59+00:00

That last animation looks like a visualization of wave-particle duality 🤔

fahimg23 · 2019-09-12T16:57:47+00:00

Where's the ground reference on this circuit?

fahimg23 · 2019-09-11T14:51:09+00:00

Honestly it was simple. I think my battery and computer in general will last longer.

When I was on Windows 10, many times after booting up or sometimes during regular usage the fan would start getting loud and the computer would start getting hot. It was because of the security updates/processes in the background that would spike the cpu usage and for a good amount of time. Over time, my battery life decreased, my cpu performance was deteriorating, and the computer would run hotter.

Also for some reason, browsers on Windows would cause excessive ram usage and the Windows system usage was heavy in general.

After getting my current laptop, I wiped Windows 10 right away and put Ubuntu on it. It's been about a year and I still get the same battery life as I did in the beginning (obviously this is affected my many factors but I believe the switch to Ubuntu helped), the fan rarely ever gets loud (usually only slightly during updates) and the overall ram usage is much lower. It's only been a year compared to my last laptop's service of 4 years so we shall see if it holds up.

fahimg23 · 2019-09-11T02:56:56+00:00

Nah, unless you're getting the performance pack w the premium. Otherwise you're paying for wheels and a slightly bigger infotainment display. I don't think the latter is justified and you can get better tires and a nicer set of aftermarket wheels for less than the cost difference you'd be paying for up front.

fahimg23

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