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# /sci/ Science & Math

## Most viewed threads in this category

comment if you're a fedora tippin' atheist!!1!
>/sci/ is militantly atheist >/sci/ has rabid hatred of gays and transsexuals
So, for my Advanced Physics course we were assigned the project of building a device that could launch a tennis ball. They will be scored for accuracy and distance, and it is a competition. What I'd like to know from you guys is how many different ways there are to propel something, such as a spring-powered mortar-style launcher or torsion-powered swinging arms as in pic related. I like to hear what you guys know of.

### Jet engine

Hi /sci/, i would to build a Jet engine. How many celsius wuld b? on the end of it?

Book recommendation thread. I want to relearn math with rigour before i move to alg.geom, complex dynamics, topology etc. I've taken math up to freshman uni. I need lots of practice problems. Any books I should read?
/Sci I don't understand Tarzan and jane, whose total mass is 130 kg, start their swing on a 5.0m long vine when the vine is at an angle of 30 with the horizontal. At the bottom of the arc,Jane, whose mass is 50 kg, releases the vine. What is the maximum height at which Tarzan can land on a branch after his swing continues? ( Hint: Treat Tarzan and jane's energey as seperate quantities.) I did P.E. = m1gh + m2gh = 50x 9.81x2.5 + 80x 9.81 x 2.5 = 3188.25 N-m K.E. = 3188.25 = 0.5 x 130 x v^2 v^2 = 49.05 v = 7.003 m/s Tarzan's Velocity alone K.E. = 0.5 x 80 x 49.05 = 1962 N-m (You could also do K.E. divided by The gravitational force [ joules divided by Newtons to get distance] but that is the same as this next step) P.E. = 1962 = 80 x 9.81 x h h = 2.5 m ans But apparently you can just do MTgh+MJgh=MTgh Solve for h and you get h = 2.5*130 / 80 = 4.06 How are they different? I doesn't everything have the same free fall acceleration regardless of mass (I mean I guess tarzan did lose some inertia dropping Jane though idk)? It should be the same like in the first example but why is it different with the P.E. only answer? Isn't Mechanical energy conserved without friction? Posted before but all answers where literally Idk why you got different answers with P.E. only vs P.E. + K.E. Can anyone here help pleas, I really don't understand.

Hello Sci, I just got offered a job at IBM! Electrical Engineering major from state school in New England. Semiconductor test/characterization/22nm mumbo jumbo. 75k starting +5k sign bonus. Has anyone else heard back yet? Lets hear what you boys and girls are up to.
Will solar energy ever be not shit?
How will science defeat Islam?

### How do i become a master hacker?

Hello, science people. I have a difficult problem to solve and I know nothing about that kind of science so... I have a heart "disease" ( https://en.wikipedia.org/wiki/Brugada_syndrome ) which means it is excpected to stop earlier than most people. BUT. I am actually absolutely impatient for that thing to happen for numerous reasons. Problem, it is unacceptable for my death to be considered suicide. What medecines or drugs should I acquire and take to just make it so that people think " Ok, so he had a Sudden unexpected death syndrome, his heart just stopped." Please, help me. I couldn't thank you enough. But I would try.
>I'm studying physics. >I like programming a lot, specially videogames and physics simulations. Are physicist well regarded as programmers by the companies? I don't see myself as a teacher nor I'm that good to be a researcher.

### any thoughts...?

http://sohowww.nascom.nasa.gov/data/realtime-images.html
whats the difference between meth amphetamine and adderall?
/sci/ I could really use some help
/Sci/ Lets say I integrate a probability density function over its domain, what is the result? I'm thinking its the expected value but I'm not confident in my memory. Pic related the 3-parameter Weibull distribution. Also lets say I integrate from 0 to the 95th percentile, would this be the expected value 95% of the time? Its been a while since I took stats.
How does /sci/ feel towards the current primary, secondary and tertiary educational systems?
Best resources (books, cellphone apps, etc.) to be fully prepared for GRE Quantitative section? and graduate school admission... "advice" general

### Faking an illness

IT'S URGENT /SCI/, I NEED YOUR HELP. :( How do I fake the symptoms of flu within the next 24 hours? I already have a slight cold and bit of a sore throat, but not enough to convince anybody yet.
Why do you hate the humanities?

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