how did this shoddy looking thing that looks like its made out of tinfoil lift off from the moon and fly back to earth?
You need rockets to lift that weight off from earth, but it can fly on it's own thrusters since the gravity is 1/6 lower on the moon :^)
Stupid troll thread but it didn't fly back to Earth. Well, except on Apollo 13.
How did leaving the moon work?
The CM was whizzing around the moon while they were down in the LM.
Then the LM went up, presumably in an arc to get into orbit?
And then they played catchup with some booster rockets until they docked?
So I guess some timing was required to rendezvouz?
Should every engineering student take a Fluid Mechanics course ?
>>7804236
EEs, CivilEs and CompEs don't need it and it takes a lot of credit hours on already clogged programmes.
No.
Doing Calculus 2 this semester, should I care about mathematical proofs at all?
>>7804219
Studying Mechanical Engineering btw.
>>7804219
Not if you want to be an engineer.
>>7804219
Nah you wouldn't be able to grasp them anyway
Hey Medifags I'm hoping some of you can help me figure out what's wrong with me.
I've had painful spasms in my back since I was a kid that would cause my legs to stop working but it only lasted a few seconds.
A few days ago I had a spasm while sitting down for the first time and while I was able to move Myles shortly after the pain didn't go away. So I went to the ER yesterday and walked into the hospital and while laying on the bed my back spasmed again any my legs can barely function. I can hardly get any sensation in my legs and I can't move anything other than my hips. And even then they're tiny movements.
Interestingly my legs aren't limp. It's like all the muscles are constantly contracted.
The ER discharged me saying its a muscular issue but I don't believe them. Do any of you have any ideas what's wrong with me?
>pic related
>>7804189
Oh and I can't support my own weight even if I'm helped up. Also I have little to no control of my legs
>>7804191
Self bump for help
>>7804196
Bump
Please help me guys!
From an evolutionary point of view, isn't morality a disadvantage?
The goals of evolution are survival of the individual and its genes. As Dawkins noted, these goals are inherently selfish. Morality, and in particular altruism, seem to be opposed to these goals. They force the individual to at least partially give up their selfishness. In extreme cases, morality leads to the individual abstaining from procreation or even sacrificing itself for others. Wouldn't a population of sociopaths have a huge advantage in terms of evolution, as they can egoistically pursue their evolutionary goals without being held back by "ethical" considerations? At least that's how it works for animals. Animals don't know morality. Only humans seem to have developed this evolutionary dead-end.
>falling for the group selection is just a meme meme
lol, that picture was made by a retard who doesn't understand evolution.
Worse they don't realize that all sorts of things coexist despite having a common ancestor.
>OP: lol we should wipe out chimpanzees. In fact we should wipe out all animals because humans are da best.
Keep being a retard, OP. This is gold.
>>7804171
No; old discussion is old.
The Selfish Gene by Richard Dawkins, if you actually read it, fully explains this, though it's now a little dated.
Read the fucking book if you're going to start quoting it, in it he explains numerous examples of animals being "moral" to each other. How it's still beneficial because evolution only works through genes, which all organisms in a species or population share to some small degree. So if you're helping your child, you're not being moral and going against evolution, you're still helping at least 50% of your own genes survive as well. That's why it's called the selfish gene, because it doesn't just apply to one single individual. Seriously you're post is ignorant as shit.
>tfw none of the probes are even remotely headed towards Planet Nine
>>7804082
It's not that difficult to adjust the orbit, in space. Some of the do cross the orbit of the planet. Adjust it, the wait for it to come along. Trust me, I've played KSP, so im an expert with regards to space travel.
Whats a good analogy for kids to describe hysterisis?
>>7804066
A key in a door lock.
No action on the key (no n-1):
The door can be open or closed (information pass through).
Action on the key (n-1):
The door is closed (information is stocked and can't be modified ~ memory).
>>7804066
Hysterisis is an outdated term for the female condition, i.e. exaggeratedly faking emotions to cover up that she's a slut.
>Fermat's Little Theorem
>Actually has huge significance on number theory and related fields
>>7803985
I would explain the last theorem of his, but this comment box is too small to write it all down.
>Uncertainty principle
>Not about uncertainty but rather indeterminability
>>7804004
Stop. This joke is not funny and is in every thread on every website with the phrase "Fermat."
Remember that \sci\ meme that eating Veges isn't better for you than eating mostly meats?
>>7803971
Eating veges doesn't make a difference because it's mostly fibre.
It's only useful if you aren't taking a multi-vit or getting your fibre elsewhere, it won't affect any aspects of your diet unless you go overboard with it when you're trying to get into ketosis etc.
>>7803994
Kek. The meme is still alive.
Going to the lab today too?
>>7803969
I should be writing right now.
>>7803969
I work in industry R&D now - we aren't even allowed in at weekends or late weeknights
It's an abstract kind of feel
haven't been to lab for almost two months
I'm so fucked, kill me
hello, /sci/
I'm looking for plants or trees that are compatible with mushroom mycelium. these plants cannot release pollen or products into the air that would contaminate or cause mold. preferrably these plants should require basic sun or little sun. does anyone have an idea?
>>7803952
are you trying to cultivate truffles I guess? not gonna work
>>7803952
A peace lilly?
What does /sci/ think about the Em Drive? At first I thought it was a meme because it violates the Conservation of momentum and Newton's Third Law but NASA's replication efforts as well as other groups of researchers have been successful and have produced thrust.
So what do you think? Will the Em Drive take humanity to the stars?
no. it scales worth than solar sails for gods sake.
>>7803959
Wrong
http://www.nasaspaceflight.com/2015/04/evaluating-nasas-futuristic-em-drive/
>Mr. Joosten and Dr. White stated that “a one-way, non-decelerating trip to Alpha Centauri under a constant one milli-g acceleration” from an EM drive would result in an arrival speed of 9.4 percent the speed of light and result in a total transit time from Earth to Alpha Centauri of just 92 years.
However, if the intentions of such a mission were to perform in-situ observations and experiments in the Alpha Centauri system, then deceleration would be needed.
This added component would result in a 130-year transit time from Earth to Alpha Centauri – which is still a significant improvement over the multi-thousand year timetable such a mission would take using current chemical propulsion technology.
>>7804070
>9.4% of c
Wut
I can't into Maxwell's Equations. I can get through the math just fine, but I am struggling with the intuition. I can picture Gauss' Laws so I guess my real issue is with the intuition for curl, and not divergence.
To gain intuition for curl, just curl up in a ball and cry like the pathetic mother fucked you are
Or go to khan Academy
Curl is how much the field looks like a whirlpool. Divergence is how much it looks like a fountain.
So what does /sci/ think, are Newtonian forces real, symmetrical and non-causal relations? Or is this view too anti-Humean to the extent that it defends the existence of forces as external relations irreducible to spatio-temporal ones?
bump?
>>7803529
>Blablabla
>>7803529
This is sci, not philosophy. Sci only cares of the model works and predicts things. Metaphysics is a branch of philosophy that is basically untestable.While metaphysics is semi-import, particularly to early physics, most 'metaphysics' of our time has to to with attempting to map mathematical assertions into the quantum world.
What's the catch that I'm missing here?
>>7803423
No need to try and subtly show off bitch.
>>7803429
I honestly don't understand... I didn't do anything... I just did my research and showed up to the meetings. I have a 2.5 GPA.
The catch is you'd be working with an illiterate.
Is he indian, OP? Don't ever work with indians.
