Amusing Science

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Re: Amusing Science

Postby Witness » Fri Dec 22, 2017 5:05 am


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Re: Amusing Science

Postby sparks » Sat Dec 23, 2017 5:22 pm

Sublimed with Salmonelliac?

WTF? :)

Oh. It's alchemy. The first attempt, nay religion if you will, for chemistry. As you were. Before you were so unfortunately sublimated.
Nice things? Hell no!

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Re: Amusing Science

Postby Witness » Sun Dec 24, 2017 5:31 am

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Re: Amusing Science

Postby Anaxagoras » Tue Dec 26, 2017 7:28 am

Makes sense if you think about it.
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Re: Amusing Science

Postby Abdul Alhazred » Tue Dec 26, 2017 10:14 am

Hmm. Is this right?

The center of gravity is falling at the speed expected for the mass of the slinky?
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Re: Amusing Science

Postby Anaxagoras » Tue Dec 26, 2017 11:14 am

Abdul Alhazred wrote:Hmm. Is this right?

The center of gravity is falling at the speed expected for the mass of the slinky?


That is correct.

The other thing to note is that the amount of stretch at the beginning is determined by gravity. If you held a slinky like that on the moon, where the gravity is only 1/6th as strong, initially it would be much shorter. On a more massive planet with stronger gravity, it would be stretched out longer.

I don't know if it's a coincidence that the bottom doesn't seem to move at all. Maybe that's just a function of how springy the slinky is, but I'm guessing it's just proportional to the amount of extension. The farther you stretch it, the faster the ends move when you release it. Unless you stretch it so far that you permanently warp the metal. Intuitively it seems right to me though.
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Re: Amusing Science

Postby Witness » Thu Dec 28, 2017 4:10 am

Anaxagoras wrote:I don't know if it's a coincidence that the bottom doesn't seem to move at all.

No. You can picture the release as a wave traveling down: as long as it hasn't reached the end, said end "doesn't know" about the release.




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Re: Amusing Science

Postby Bruce » Fri Dec 29, 2017 10:06 am

Perfectly describes what a typical day as a research scientist is like:
Such potential!

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Re: Amusing Science

Postby Witness » Fri Jan 05, 2018 4:08 am

There are hundreds of proofs of Pythagoras' theorem. but this one is kinda cute:

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Re: Amusing Science

Postby Witness » Sat Jan 06, 2018 3:26 am

Evolution & Human Behavior wrote:Different impacts of resources on opposite sex ratings of physical attractiveness by males and females

Abstract

Parental investment hypotheses regarding mate selection suggest that human males should seek partners featured by youth and high fertility. However, females should be more sensitive to resources that can be invested on themselves and their offspring. Previous studies indicate that economic status is indeed important in male attractiveness. However, no previous study has quantified and compared the impact of equivalent resources on male and female attractiveness. Annual salary is a direct way to evaluate economic status. Here, we combined images of male and female body shape with information on annual salary to elucidate the influence of economic status on the attractiveness ratings by opposite sex raters in American, Chinese and European populations. We found that ratings of attractiveness were around 4 times more sensitive to salary for females rating males, compared to males rating females. These results indicate that higher economic status can offset lower physical attractiveness in men much more easily than in women. Neither raters' BMI nor age influenced this effect for females rating male attractiveness. This difference explains many features of human mating behavior and may pose a barrier for male engagement in low-consumption lifestyles.
http://www.ehbonline.org/article/S1090-5138(17)30315-X/fulltext

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