From making bombs alone you can calculate there are enormous amounts of U238 (known as depleted uranium) lying around. And there are no good uses for this really other than for research in fast breeder reactors and ammunition.
I hear it can be used for armor around jet engine turbine section to prevent turbine failure from slicing through the aircraft like knife through hot butter but that is not such a huge demand either.
So if you can find a good use for all this the US is all ears.
Answer this You have the simpliest circuit in the world: A lightbulb and a switch. You turn it on for an hour, then you switch it on and off for an hour. Which takes more energy and why?
I was arguing about this with my friends for like 3 hours. My logic is that if you switch it on and off regularly it takes half of the energy needed to be lit for an hour. They said that a single click to light it needs more energy. It's an analogy to car engine. You need some fuel to turn it on but it takes less fuel when it's on.
Depends: If the circuit is using direct current, you're correct. If alternating current is used, They are correct that it takes more energy, but for the wrong reason. It has to do with just how many Joules/coulomb you can squeeze out of a modern-day battery source. Hope that helps.
You are right and they are wrong. They are probably confused because they heard that will wear out the bulb faster (which is true), but it won't use more energy.
You can see that's the case even without a current meter. If switching it on used more energy, that energy would still have to go somewhere, ie light or heat. It doesn't create a bright flash of light, so that leaves heat. Does the bulb heat up instantly in a flash, burning your hand if you are touching the bulb when it turns on? No, it starts out cool and takes several seconds to warm up.
So sci bc because of my curiosity, do any of you know of a portable power source that holds more "juice" than any other portable power source? I'm talking raw power not like an iphone charger or some lower tier BS like that.
I've recently gotten a sudden urge to learn maths from the ground up. I have a very scattered education on math so most of it doesn't make sense to me. That's why I want to learn from the very beginning and make my way to the VERY advanced stuff.
I know this isn't going to be a walk in the park. It's going to take years and there's a chance I'll just fall behind and stop. But at the moment I'm very determined to learn all I can and I need your help. Where do I start. Where do I go? I found this chart on the /sci/ wiki but... Comment too long. Click here to view the full text.
>>7771184 Anyone? I'm in need of some hardcore help here. Also while we're at it, if anyone needs help learning certain types of math, they can post in this thread. It was a bit selfish of me to just want the thread about teaching me.
I only minored in math so I dont know if I can speak to the 'very advanced' stuff.
If you're doing this for yourself I would go on Kahn Academy and just do the natural progression they've laid out. Something like Alg.1->geomtry->Alg.2->Pre Calc->all the calc courses->DEs->Linear alg.->etc. If you already understand a topic skip over it. Kahn explains maths a lot better than most textbooks will. It will give you a pretty good foundation to go explore whatever you find interesting afterwards.
so, had an interesting chat with a creationist, and he posted this gem, i wonder how you guys might respond to such a statement, because i'd like to know how to accurately respond to this in the future.
There's different animals alive right now that look "morphologically contiguous" to eachother.
>If bobcats were extinct animals, and domestic house cats were extinct animals from an earlier time period, they would line up their fossils together and claim that the house cat evolved into the bobcat.
You could analyze their morphology relative to whatever "ancestors" or "descendants" you found (i.e. before cats and after bobcats), but assuming this is just a simple thought experiment, then no, you wouldn't really be able to tell the difference.
At the same time, in the fossil record you don't know what species evolved into what species. You just know that they are kin. You don't know if there is a direct ancestry there. Just like... Comment too long. Click here to view the full text.
If you found a house cat skeleton and a bobcat skeleton, you could say that the bobcat is related to that house cat. Related. You CANNOT say that the bobcat is a direct descendant from that house cat. For all you know, house cats and bobcats could have shared a common ancestor (let's call it desert cat), an in this case bobcats would NOT have been descendants/evolved from house cats, even though the fossil record could have made it looked like it.
I lost my parents as a teenager and became homeless. I missed out on high school education, but I've been saving up money to go to college for the last 5 years. I still have about a year of saving before I feel comfortable going to school with enough money to fall back on. I want to major in aerospace engineering by attending a community college and then transferring to a major university (there is a good school and program in my area to do this).
Has anyone here succeeded in college without a strong background of education and support?
What should I be learning on my own before I attend school?
>>7771027 I never went to school and wasn't given education beyond basic numeracy and reading/writing.
I am now studying engineering a top uni. It's possible if you have the brains and the dedication. I wouldn't class myself as exceptional among my class and I think the average engineer would be capable of doing the same so you don't have to be a genius, just capable of being an engineer.
What I did: 1: got all the books for the entrance exams 2: found a place that would allow me to sit... Comment too long. Click here to view the full text.
Most of what I've read indicates that the really big invertebrates (insects, spiders, etc.) of ages past disappeared due to falling oxygen levels. Let's say a person with a fairly large amount of cash created a sealed hyper-oxygenated environment, say the size of a warehouse, and began selectively breeding modern insects and arachnids for size along with providing them an ideal diet for growth. Could that person get bugs the size of the ones of the Permian period? If so roughly how many generations do you think it would take and what insects or arachnids would be ideal... Comment too long. Click here to view the full text.
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