Search found 10 matches

October 19th, 2017, 10:24 am
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44214

Re: Fermi Questions C

If the entire population of the earth was converted to energy and used to power a MacBook Air, how far would the chain of all the electrons that pass through the MacBook in that time stretch in light seconds?
October 5th, 2017, 10:13 pm
Forum: 2018 Lab Events
Topic: Materials Science C
Replies: 48
Views: 11458

Re: Materials Science C

Ok, thanks. I'll do that.
October 1st, 2017, 7:16 pm
Forum: 2018 Lab Events
Topic: Materials Science C
Replies: 48
Views: 11458

Re: Materials Science C

So, I'm kinda new to this event. Do you guys have any suggestions on a good place to start preparing?
September 15th, 2017, 12:01 pm
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44214

Re: Fermi Questions C

Answer|The luminosity of the sun is about 1E24W. I know this fluctuates, but I'm going to assume it's constant. Assume the sun has a lifetime of 10 billion, or 1E10 years. There are 3E7 seconds in a year, which gives a total time of 3E17s. P=E/t, so the total energy is 3E41J. 1 kilogram of TNT has ...
September 13th, 2017, 9:33 pm
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44214

Re: Fermi Questions C

Yeah, that's a good point. I think that bumps my answer up by 2 then.

How fast would Santa have to travel to visit every child in the world in one 24-hour period?
September 13th, 2017, 7:42 pm
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44214

Re: Fermi Questions C

Answer|Radius of the earth is 6E6m. 4pir^2 gives a total surface area of 4.3E14. Assuming the earth is 75% water gives 3.2E14 m^2 of water. Assuming an average depth of 10m gives a volume of 3.2E15 m^3. The volume of a cylinder is pir^2h. Solving this for h gives a height of 1.1E15m. Pressure is eq...
September 13th, 2017, 5:23 pm
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44214

Re: Fermi Questions C

Ok, thanks. I just figured that not all the calories in a can of soda come directly from sugar, and also that people eat a healthy amount. I probably am a bit low though. I'll ask another question. If an army of 500 industrious beavers wanted to log the entire Amazon rainforest, how long would it ta...
September 13th, 2017, 12:24 pm
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44214

Re: Fermi Questions C

I'm still kinda new, any feedback would be appreciated. An abomination called my work|Assume the average American consumes 50g of sugar a day and 40 grams of sugar has 100 calories, giving 1.2E2 calories per person per day. Multiply by 3E8 people in America and 365 days to get 1.3E13 calories in a y...
September 11th, 2017, 1:50 pm
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44214

Re: Fermi Questions C

Sorry, should have clarified. Only shells that are intact and on the surface to an inch deep. Any kind of shell though
September 11th, 2017, 12:33 pm
Forum: 2018 Question Marathons
Topic: Fermi Questions C
Replies: 175
Views: 44214

Re: Fermi Questions C

If she sells all the seashells on all the seashores on earth, how much money will she make?