[REQUEST] Is this actually true?
https://redd.it/1bdcm2s
@TheyDidTheMath
[Request] The Statue of Liberty
https://redd.it/1bd85bh
@TheyDidTheMath
Request fermenting maple sap into wine
I feel like this turns into a mixtures equation which I have always struggled with.
If the specific gravity of maple sap is 1.009, and a 42:1 reduction turns that into syrup at SG 1.13, how much sap do I need to give myself 21L at SG 1.10 ?
I would be happy with an answer to the above, but I also already have 10L that has been reduced to 1.05 SG. How much more sap would I require?
https://redd.it/1bbcb4r
@TheyDidTheMath
Request How much Gatorade powder would be needed to effectively turn the world's oceans into tolerable tasting Gatorade?
With the salt content of the ocean it would taste like garbage so for the sake of the question assuming the ocean is fresh water instead.
https://redd.it/1bbcjkg
@TheyDidTheMath
[request] what actually are the chances of this situation happening?
https://redd.it/1bbahm8
@TheyDidTheMath
[Request] How much rain does there need to be in order to power a gutter pipe turbine op to 100Watts?
https://redd.it/1bb5til
@TheyDidTheMath
Request How much time would have pass on earth if you travel for 10 years at 80% the speed of light and at that point you decide to return but at the speed of light.
Would the traveler come back to experience a significant change on time?
https://redd.it/1bb2mzl
@TheyDidTheMath
[REQUEST] How much money would they make if they bet on Pole, Win and FL every time?
https://redd.it/1bawa41
@TheyDidTheMath
[Request] In Atomic Robo, they use super-science to slam a 20k ton train into an alternate earth at 99.995% the speed of light like a bullet. What would this do to Earth (and Earth's moon) if this happened? Would there be anything left at all? How would other planets in the solar system be effected?
https://redd.it/1batzhe
@TheyDidTheMath
[REQUEST] How much fuel and CO2 could have been saved by not running these flights? What’s that equivalent to?
https://redd.it/1baoc0q
@TheyDidTheMath
[Request] Based on how long the boyfriend was falling for, how deep was the fall into the manhole?
https://redd.it/1bamjk9
@TheyDidTheMath
request how many satellites would it take to completely surround the earth?
https://redd.it/1bak7ls
@TheyDidTheMath
Request I heard someone say that the US dollar has deflated in value by over 95% since 1970, is that true?
I'm not an economist etc... but I've been trying to understand the financial market etc... Is the above true and how is it actually worked out?
https://redd.it/1bahnog
@TheyDidTheMath
[Request] How fast is the last gear spinning ? Or how many times faster than the first one ?
https://redd.it/1ba97r2
@TheyDidTheMath
Request So, how long can one survive on the surface of the sun?
Let's say that a person can be teleported instantly. If we were to teleport this person to the surface of the sun (the hottest part) what is the longest amount of time that we can wait before teleporting them back so that they are still alive? What is the longest time that we can wait so that they do not have any burns? Just a random thought I had while thinking about different materials heat transfer properties.
https://redd.it/1ba01iz
@TheyDidTheMath
[Request] How tall would the tower be?
https://redd.it/1bd7qo8
@TheyDidTheMath
[self] Calculate your own output horsepower
https://redd.it/1bb4wmu
@TheyDidTheMath
[Request] Is it theoretically possible to fill the board without making a square or diamond shape?
https://redd.it/1bba8ns
@TheyDidTheMath
[Request] Is this accurate?!
https://redd.it/1bbcf71
@TheyDidTheMath
[Request] Can The Flash run up the ceiling indefinitely, assuming he's in constant speed when he's on the ceiling, or will gravity eventually take its course?
https://redd.it/1bb7xck
@TheyDidTheMath
[Request] Can you die from swallowing too much of these salt pills? If so, how many pills do you need to take?
https://redd.it/1bb4ymd
@TheyDidTheMath
[Request]How much force would need to be exerted in order to shatter a steel construction I-beam like in this frame of Batman Beyond (1999)?
https://redd.it/1baw0h1
@TheyDidTheMath
Request How do you solve this HIV test puzzle?
I was flipping through a book called "Mathematical Brainteasers" by a Owen O'Shea. It posed this problem (verbatim):
"A heterosexual patient with no known risk behavior goes to his doctor because he is worried in case he has been infected with HIV. The doctor tells him that he should undergo a test to see if he is infected with the virus. The doctor assures the patient that only 0.0001 percent of the population who has no risk behavior is infected with HIV. The patient is also told that if a patient has the virus, there is a 99.99 percent chance that the test result will be positive. If a patient is not infected, there is a 99.99 percent chance that the test result will be negative. What is the chance that a patient who tests positive actually has the virus?"
The solution is provided as:
"On being presented with this problem, most people would believe that the probability that the patient has HIV is somewhere near 99%. Surprisingly, this answer is incorrect. The correct answer is that the probability that the patient has HIV is 50 percent! How is this answer arrived at? One way of getting the correct result is to imaging that 10,000 patients go for the test. One patient will have HIV. Therefore, his text will prove positive. We are told that if a patient does not have the virus, there is a 99.99 percent chance that the test will prove negative. That means that if there are 10,000 patients undergoing the test, one of them, who does not have the virus, will prove positive. Therefore, of the 10,000 patients undergoing the test, one of them, who does not have the virus, will prove positive. Therefore, of the 10,000 patients who undergo the test, 2 patients will have results that prove positive. Of course, only 1 of those 2 patients will have the virus. Therefore, if a patient's test result is positive, the probability that the patient has the virus is 50 percent."
They cite "Gerd Gigerenzer, Calculated Risks: How to know when Numbers Deceive You (New York: Simon and Schuster, 2002), pp. 124-25.
The solution provided is nonsense right? I think they conflated "one in ten thousand" with "one ten-thousandth of a percent" (which is one in a million, not one in ten thousand) and the answer also depends on the prevalence of HIV in the tested population, not something that can be derived from the problem itself (and they pull a dubiously neat figure out of their ass in the solution). Am I just bad at biostatistics or is the book wrong?
https://redd.it/1bas2mt
@TheyDidTheMath
Request Is a floating ring around earth possible?
Sister had a wild thought that if a ring was around earth, it wouldn't fall because it would be pushing the other side away from earth. Obviously this is impossible due to a) Building it, and b) pressure
But is it theoretically possible with a correct size and material?
https://redd.it/1bamu2v
@TheyDidTheMath
[REQUEST] What was the rough fuel to get this to the space station?
https://redd.it/1ban0xq
@TheyDidTheMath
[request] would this be possible?
https://redd.it/1bal6gm
@TheyDidTheMath
[Request] What are the chances...
https://redd.it/1baiznr
@TheyDidTheMath
Request Aviation safest travel claims
TL;DR: is aviation really the safest way to travel no matter how you look at the data, or is it the 'big aviation' propaganda engine?
Aviation is often touted as the safest way to travel, cause they go with fatalities (injuries?) per distance traveled per person (or something like that).
What if we exclude the 2 heavy hitting statistics of the aviation industry: their non-comparable distance traveled, and the fact that they typically have a high passenger count, and when incidents occur most people tend to die, a sort of all or nothing approach.
How would it compare if we make it for instance fatalities/injuries per hour per person, or even per 'trip'?
https://redd.it/1badacw
@TheyDidTheMath
[Request] would this work?
https://redd.it/1b9ri6o
@TheyDidTheMath
[REQUEST] How fast Starship must to spin in order to generate meaningful artificial gravity?
https://redd.it/1ba0rl6
@TheyDidTheMath
