## Fermi Questions C

Unome
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### Re: Fermi Questions C

Attempt

How much energy would be required to boil all of the world's oceans, in units of the amount of calories consumed in the form of potato chips annually in the US?
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NeilMehta
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### Re: Fermi Questions C

Unome wrote:
Attempt

How much energy would be required to boil all of the world's oceans, in units of the amount of calories consumed in the form of potato chips annually in the US?

Attempt

Solution

new question: how many µL of ink would it take to print one copy of Shakespeare's Romeo and Juliet?
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### Re: Fermi Questions C

NeilMehta wrote:new question: how many µL of ink would it take to print one copy of Shakespeare's Romeo and Juliet?

Attempt

Solution

New question
Assuming everyone in the world weighs 100 kg, if everyone in the world was converted to pure energy, how long will it take for the sun to create the same amount of energy
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Unome
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### Re: Fermi Questions C

Attempt

Actual

How many pixels are on the screens of all iPhone 5's (standard version only) ever produced?
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Name
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### Re: Fermi Questions C

Unome wrote:How many pixels are on the screens of all iPhone 5's (standard version only) ever produced?

Attempt

Actual

How many moles of oxegen molecules will one RBC carry throughout it's lifetime?
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Riptide
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### Re: Fermi Questions C

Name wrote:
Unome wrote:How many pixels are on the screens of all iPhone 5's (standard version only) ever produced?

Attempt

Actual

How many moles of oxegen molecules will one RBC carry throughout it's lifetime?

Attempt

Actual

How many rotations are there of all the carbon-carbon single bonds in one mole of natural gas at room temperature in 1 hour?
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### Re: Fermi Questions C

Riptide wrote:
Attempt

Actual

How many rotations are there of all the carbon-carbon single bonds in one mole of natural gas at room temperature in 1 hour?

Looks correct but I asked for moles -10
Attempt

Actual

Question: If the earth became the density of a marshmallow what would the diameter (In meters) have to be to have the same gravitational attraction
Last edited by Name on February 21st, 2018, 8:28 pm, edited 1 time in total.
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Riptide
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### Re: Fermi Questions C

Name wrote:Looks correct but I asked for moles -10

Name wrote:Question: If the earth became the density of a marshmallow what would the diameter (In meters) have to be to have the same gravitational attraction

Attempt

Actual

If quantum mechanics didn't exist, how hot would the sun's core have to be to fuse hydrogen nuclei into helium (kelvin)?[/quote]
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### Re: Fermi Questions C

Riptide wrote:
Name wrote:Looks correct but I asked for moles -10

Name wrote:Question: If the earth became the density of a marshmallow what would the diameter (In meters) have to be to have the same gravitational attraction

Attempt

Actual

If quantum mechanics didn't exist, how hot would the sun's core have to be to fuse hydrogen nuclei into helium (kelvin)?
[/quote]

If u decrease the radius you also decrease the total mass. The volume of the object (which increases the mass) is cubed and the radius in the equation is only squared so if the radius is increased by N times the gravitational pull is increased by N^3/N^2 times or by N times. Because marshmallow is 10x less dense the earth, then the radius would be increased by 10x yielding 6E4 km radius or 8 meter radius

Idk how quantum mechanics works so I'll let someone else do it
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Riptide
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### Re: Fermi Questions C

Name wrote:
Riptide wrote:
Name wrote:Looks correct but I asked for moles -10

Name wrote:Question: If the earth became the density of a marshmallow what would the diameter (In meters) have to be to have the same gravitational attraction

Attempt

Actual

If quantum mechanics didn't exist, how hot would the sun's core have to be to fuse hydrogen nuclei into helium (kelvin)?

If u decrease the radius you also decrease the total mass. The volume of the object (which increases the mass) is cubed and the radius in the equation is only squared so if the radius is increased by N times the gravitational pull is increased by N^3/N^2 times or by N times. Because marshmallow is 10x less dense the earth, then the radius would be increased by 10x yielding 6E4 km radius or 8 meter radius

Idk how quantum mechanics works so I'll let someone else do it[/quote]

Completely didn't consider the change in mass due to the change in the radius. Nice question!
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### Re: Fermi Questions C

Riptide wrote:Completely didn't consider the change in mass due to the change in the radius. Nice question!

Lol I didn't make the question. It was on my regionals test and I did the same thing as you did, but afterwards when I thought about it I realized that mass would decrease when radius decreases
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Riptide
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### Re: Fermi Questions C

Name wrote:Looks correct but I asked for moles -10

Name wrote:Question: If the earth became the density of a marshmallow what would the diameter (In meters) have to be to have the same gravitational attraction

Attempt

Actual

If quantum mechanics didn't exist, how hot would the sun's core have to be to fuse hydrogen nuclei into helium (kelvin)?
University of California at Berkeley '23
Seven Lakes High School '19
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PM2017
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### Re: Fermi Questions C

Riptide wrote:
Name wrote:Looks correct but I asked for moles -10

Name wrote:Question: If the earth became the density of a marshmallow what would the diameter (In meters) have to be to have the same gravitational attraction

Attempt

Actual

If quantum mechanics didn't exist, how hot would the sun's core have to be to fuse hydrogen nuclei into helium (kelvin)?

Check out the discussion on Gamow peaks in the astronomy question marathon for more info on this...
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Name
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### Re: Fermi Questions C

Riptide wrote:If quantum mechanics didn't exist, how hot would the sun's core have to be to fuse hydrogen nuclei into helium (kelvin)?

Question: how many brain cells did I lose from doing that question? (Jk)
Actual question: Suppose betelguese retained the same mass but decreased it's radius to that of the earth. If you travel at it's escape velocity for a gigamole of planck seconds how many times can that travel across Earth's equater
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Unome
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### Re: Fermi Questions C

Attempt

Actual

How much is the mass of all the live rhinoviruses in the world in units of the mass of a standard No. 2 wooden pencil?
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