I hope you mean through the attic and out the roof or siding. A dryer vent should not vent into the attic space or you are at high risk of having problems with mold.
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No Stupid Questions@lemmy.world•why do reverse thrusters work on an airplane, but a fan on a sailboat doesn't work?
3·28 days agoAdding a fan to a sailboat might help you stop said sailboat. Adding a fan to a swamp boat is not stupid and does work.
https://www.airliners.net/forum/viewtopic.php?t=738011
I tried to find a figure for what percentage of the normal operating thrust a thrust reverser configuration can provide and couldn’t readily find that info. However, according to that forum, thrust reversers only really reduce stopping distance by 10% or so and are deployed primarily to help maintain control in case there is uneven braking due to poor runway conditions.
Also, multiple sources say thrust reversers only work effectively at high speeds, and lose effectiveness at low speeds. I didn’t find an analysis on why that is the case, but it has something to do with the flow rate of air through a jey turbine being much lower at low speeds.
A sailboat will always be at low speeds relative to the wind. A thrust reverser configuration might provide some usable thrust, but you would be much better off just using the fan directly for propulsion and skip the sail altogether. Even that is very inefficient compared to propelling against water.
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Ask Science@lemmy.world•If an electron does quantum leaps or quantum tunneling, how does it know or have we figured out where it will end up? How do we know it's the same electron? Do they have signatures or tells?English
33·1 month agoQuantum tunneling isn’t as mysterious as popular discourse likes to make it sound.
Quantum tunneling involves barriers to movement. Think an insulator around a wire. Electrons can freely move throughout the bulk of the metal and even just a little bit outside of the metal, but they can’t transfer to the atoms in the insulating material. However, if you have an arrangement like two pieces of metal separated by a very small bit of insulator, tunneling can become possible. Classical mechanics would say that any amount of insulator between conductors should be able to completely stop charge transfer between conductors no matter how small. However, the wave function that describes an electron’s characteristics isn’t just a single point. It is spread out a bit. If the insulating layer is small enough, sometimes the electron wave functions will span through the insulating layer and a small portion of it extends into the next conductor. This means that if we measure the charge state on both pieces of metal, every once in a while, the charge state of one will decrease at the same time that the charge state of the other increases by the value of 1 electron. Lots of factors change how often this happens, such as a strong electric field. So do we know where the electron has gone? Not specifically, but we know the charge states of the two regions and it is otherwise confined. Do we know if it is the same electron? No, electrons are completely indistinguishable, and this is actually a pretty important concept for quantum mechanics. But whether it is the same electron, or if there’s some exchange that occurs during the tunneling doesn’t really matter. We know that a charge transfer has occurred through a barrier without adding or removing energy.
I see you took the “dull” requirement literally.
I bet having the blades on in the wrong orientation put a ton more wear on your belt, and you were probably burning more fuel than necessary too.
Really? Are you not able to install yours upside down? If you do that then the sharpened edge will be on the trailing side. The mower blades I’ve used would be very obvious that they are upside down, but it is doable.
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No Stupid Questions@lemmy.ca•Can I unroll and let a new mattress start to decompress without taking it out of the plastic wrapping yet?
2·2 months agoIf you cut a corner off the bag that should let air in while still keeping dirt/dust off. Then you can cut the rest of the bag off tomorrow.
That said, what are you worried about getting on your mattress over a single night? Do you have pets that will be checking it out?
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math@lemmy.world•Not homework. Planet size mass. Two cars driving, one following equator, the other a circle near the North pole. How far away does the driver need to turn the wheel to stay the same distance away?
7·2 months agoThe transition is continuous and doesn’t occur at any singular distance from the pole. The angle of the steering wheel would likely go as something like cosine(theta)/r where theta is the angle from the pole (90-latitude), and r is the radius of the circle from the pole which would go as R*sine(theta) where R is the radius of the earth. The reasoning for picking cosine is that the effect you are describing comes from how well aligned the gravity vector is with the acceleration vector to go on a circle. When near the pole, the tires do all the acceleration. When near the equator, gravity does the acceleration. Putting that together the steering angle would be proportional to cotangent(90-latitude)/R. Of course this approximation assumes an absurdly smooth sphere. Any local topology completely overwhelms this effect.
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PC Master Race@lemmy.world•Huh, who knew Noctua made suitcasesEnglish
10·2 months agoI was going to make a static pressure pun related to luggage, but I just don’t have the head for that.
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People Twitter@sh.itjust.works•Stay cool or look slimmer. Tough choice.
12·2 months agoThey need to add heater packs underneath and thermocouple readings. While white is good at rejecting external thermal radiation, it is also poor at emitting thermal radiation. A white surface can be hard to keep cool if the heat comes from within. In particular, white will look like it has a much better comparitive advantage when imaged in IR than is likely to be the case in real usage conditions.
Yellow, red, and gray may be more comfortable in practice.
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World News@lemmy.world•Toyota reveals desire to charge customers for new features added through over-the-air software updatesEnglish
5·2 months agoYou’re right. In correcting one typo, I deleted the short press count without noticing.
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World News@lemmy.world•Toyota reveals desire to charge customers for new features added through over-the-air software updatesEnglish
7·2 months agoHave you tried using the key fob for remote start? The app based remote start is subscription locked but on our 2021 if you short press the lock button (edit: twice), then press and hold the lock button until the head/tail lights start flashing it will start up and either heat or cool the cabin depending on temp.
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3DPrinting@lemmy.world•Interesting sample print from 20 years agoEnglish
16·3 months agoBinder jet printing is another posibility, both binder jet and sls have that rough surface.
putt.day #95 ⛳ 4/14 Albatross · 🔥4 🟡🟡🟡🟢 https://putt.day/s/Nlb0CR9CsHVq
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PC Master Race@lemmy.world•Intel CEO hints at return to the memory business — says market is ripe for innovation, hints at stacking memory and CPUEnglish
7·3 months agoWhen lead times grow, companies start ordering further and further out to make sure they won’t get stuck waiting in line.
The whole “sold out until end of 2027” thing should not be taken nearly so literally. Yes, memory is in high demand, but that doesn’t mean there’s literally a year and a half worth of gap between production capacity and demand. If someone magiced tons of memory into existance, most of those orders would not be ready to take delivery. We saw the same thing with the automotive chip shortages. There were tons of articles about crazy lead times, then once supply started catching up again it was suddenly a non issue.
I have found two suppliers of decaf whole bean coffees I like. Magnolia coffee co has a brazil decaf swiss water process and a decaf colombia sugar cane process. I also like Counter Culture Slow Motion. These are all medium roast.
I actually use a blend of half decaf beans and half Jagshead Coffee Roasters Torogoz blend for my daily latte. I find that full caffeine makes my heartburn worse. I like medium-light roasts though so these options might not line up with your tastes.





Raskin has been putting in a lot of good work investigating corruption. I think he would be a good pick.