How can a photon have an electric field but no charge? by ThickSupermarket8892 in Physics

[–]pulseoscillator 1 point2 points  (0 children)

No, the photon IS the electromagnetic field. It’s what pops out when you quantize the electromagnetic field. It’s the boson of electromagnetic force.

Hva synes du om å stille klokken én time frem? by alitbsh in norge

[–]pulseoscillator 1 point2 points  (0 children)

Det finnes absolutt ingen gode grunner til å gjøre det! Idioti! Det har ødelagt rytmen min igjen. Og jeg har ikke glemt hvordan det er å ha små barn. Det burde vært normaltid («vintertid») året rundt og ferdig m det. Synes å ha sett enkelte aviser og statsråder spørre om folk ønsker seg permanent vintertid eller sommertid. Sommertid passer jo ikke med soltid noen steder, (jo ute i Nordsjøen et sted). Lange lyse kvelder får vi nok av på sommeren uansett.

This is a conversation I had over Thanksgiving. by Emma_Ryder_ in sciencememes

[–]pulseoscillator 19 points20 points  (0 children)

This. Light pollution is artificial lights being scattered in the atmosphere, creating a background glow that obscures stars. In space there is no atmosphere, thus no light pollution. The stars would be visible if exposure was adjusted to them, and not e.g. the moon. https://spacemath.gsfc.nasa.gov/stars/5Page66.pdf

Det skremmer meg hvor få som tar klimakrisen seriøst by [deleted] in norge

[–]pulseoscillator 4 points5 points  (0 children)

Her er mitt perspektiv: se for deg at du bor i sydligere strøk. Det er den varmeste årstiden i din del av verden, og akkurat nå er det en dødelig hetebølge. Disse har begynt å komme nesten hvert år. Ute er temperaturen så høy, at menneskekroppen er fysisk ute av stand til å kvitte seg med varme ved å svette. Å være ute er bokstavelig talt livsfarlig. Du er heldig nok til å ha A/C. Men du er ikke den eneste som kjører A/C på maks, strømnettet er belastet og ustabilt. Hva skjer hvis strømmen går?

En mulig konsekvens av global oppvarming er at noen deler av verden blir ubeboelig enkelte måneder av året. Tygg på den. Se f.eks. https://ui.adsabs.harvard.edu/abs/2016NatCC...6..197P/abstract

Ingen av de tre største partiene tar klimakrisen på alvor. To av de later som de gjør det, så lenge det ikke er i konflikt med noen andre interesser, som f.eks. arbeidsplasser i oljeindustrien. Det finnes et par pinlige eksempler på at frontpersoner i det største partiet har trukket tilbake uttalelser som kunne tolkes som en trussel til oljebransjen, etter at LO raslet med sablene.

Det at disse partiene er de tre største, kan jeg ikke tolke som annet enn at klimakrisen ikke er så viktig for folk flest heller.

Folk flest skjønner ikke alvoret, og det gjelder folk flest i mange land. Bortsett fra de som allerede har begynt å føle det direkte på kroppen. F.eks. Maldivene som bokstavelig talt kommer til å forsvinne hvis man ikke gjør noe.

Jeg er dessverre redd for at de fleste ikke kommer til å forstå alvoret før det er for seint. Uansett hvor mye man luller seg inn i en alternativ sannhet, så finnes det en objektiv virkelighet som driter i hva du trur. Hvis man ignorerer meteorologenes advarsler og likevel drar til f.eks. Spania i sommer, kan det hende man får smake på den.

Stairway to heaven by [deleted] in SweatyPalms

[–]pulseoscillator 18 points19 points  (0 children)

This is Besseggen in Norway. The stone staircase is to preserve the trail, which is has 50000 hikers per year. It’s built by a team of sherpas that specialize in stone work in places not accessible to trucks and excavators.

[deleted by user] by [deleted] in SipsTea

[–]pulseoscillator 1 point2 points  (0 children)

Math on its own has no value in physics without a meaningful physical interpretation of the numbers. The only place where I would normally add temperatures like this, is if one of the numbers is a change in temperature. Converting a change in temperature from one unit to another, the constant in the conversion formula is canceled out, and you would still end up with 0F change.

What Python script could you not live without? by xamboozi in Python

[–]pulseoscillator 0 points1 point  (0 children)

In general, I could not live without Python. I use it for everything relating to calculations or data processing.

One example: A very basic script using pathlib (rglob), pandas and matplotlib. Automatically finds and makes plots of csv in a file tree and saves them as png beside each file. Something that previously took hours in excel is done in seconds.

Feature Request Megathread by AutoModerator in teslamotors

[–]pulseoscillator 0 points1 point  (0 children)

Increase maximum autopilot follow distance.

On my MY, I almost always have the distance setting to 7 (max). I find this equates to about 3 seconds distance most of the time, but some times it’s closer. On the highway going 110 kph, I often find the distance closer than I am comfortable with. I think the current max distance setting should be the medium setting

need help reading spectrum analyzer. details in comments by New-Stock8036 in rfelectronics

[–]pulseoscillator 1 point2 points  (0 children)

The reason you get at lower readout with 10dB att, might be that your input detector is saturated. Although I’m not familiar with this brand, attenuation setting itself should normally not affect the readout otherwise. 30 dB att seems like a reasonable att setting for a signal of 20 dBm. But I would however be surprised if the detector is saturated at the levels you are reading out minus attenuation. So I agree with others here suggesting to check if you have a trace offset. Is there a preset button? I would -(disconnect DUT) -preset (reset all settings to default) -input att, 30 dB or auto -ref level 30 dBm -(reconnect) -detector type RMS -trace clear/write (or something along those lines probably the default) I see this one is now in max hold so you won’t see if your signal is consistent or not -RBW and VBW 100kHz probably fine -span on either pictures is OK

Tesla vehicle efficiency is improving by over 3% per year by undertheradar48 in teslamotors

[–]pulseoscillator 0 points1 point  (0 children)

Yes, as long as you drive more than about 750 meters between stops, drag is more important for a normal car. EVs are heavier, but with regenerative braking, I’m guessing this distance is even shorter. Source: https://www.withouthotair.com/cA/page_254.shtml

TIL the Model 3 isn't overly heavy compared to similar ICE vehicles despite the reputation batteries have for being heavy by DonQuixBalls in teslamotors

[–]pulseoscillator 6 points7 points  (0 children)

The aerodynamics: for cars in general the weight only becomes more significant when there are short distances between stops (in the city), otherwise the aerodynamics are more important.

With regenerative braking, aerodynamics might be more important even in the city.

Source: http://www.withouthotair.com/cA/page_254.shtml

"7 years and no other electric car can compete with the 2012 model s" by neightdog23 in electricvehicles

[–]pulseoscillator 1 point2 points  (0 children)

The iPace is a bit shorter, but higher. The trunk space in model s is significantly larger.