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SMBC Comics Forum • View topic - [2013-Jan-15] hmm
Page 1 of 1

[2013-Jan-15] hmm

PostPosted: Tue Jan 15, 2013 1:29 pm
by saskiiaa
http://www.smbc-comics.com/index.php?id=2856#comic

I wonder whether I'll hear anything from any future students, who will have read this comic too.... XD

Re: [2012-01-15] hmm

PostPosted: Tue Jan 15, 2013 1:41 pm
by i
It says 'no air resistance', which is different than 'no air'.

Re: [2012-01-15] hmm

PostPosted: Tue Jan 15, 2013 2:31 pm
by Chard
Can we also assume the Earth is flat and gravity is constant and there's no horizontal deceleration at all? If so I get 2h 32m 26.41s. Sadly by that time the actual surface of the Earth is more than 2km below the hypothetical plane the ball bounces along. Of course another answer might be 490 bounces, or 489 bounces and one hitting the ground and rolling.

Re: [2012-01-15] hmm

PostPosted: Tue Jan 15, 2013 4:40 pm
by powersmp

Re: [2012-01-15] hmm

PostPosted: Tue Jan 15, 2013 4:42 pm
by btve
hmm I think the answer is wrong by the way. The time given is the time at which the ball first touches the ground. A study using potential energy should be more usefull here. Sadly I have no time to solve this...

Re: [2012-01-15] hmm

PostPosted: Tue Jan 15, 2013 4:50 pm
by btve
by the way I think that the ball will bounce 1490 times before stoping... (Ek+Ep=1/2mv^2 + mgh).

Re: [2012-01-15] hmm

PostPosted: Tue Jan 15, 2013 5:37 pm
by powersmp

Re: [2012-01-15] hmm

PostPosted: Tue Jan 15, 2013 10:23 pm
by cosmosis
Just wanted to mention:

Surface area of all land on Earth: 148.3e6 km^2
Surface area of one human (very conservative): 2 m^2

148.3e6 km^2 / 2 m^2 = 7.415e13 people needed to cover the surface of Earth's land.

So the probability of hitting a person, assuming the ball is launched from a random location on land and all dead humans are randomly scattered across the land mass of the earth is: 7e9 people on Earth / 7.415e13 = approximately 0.01% chance of the bowling ball hitting a body on its first bounce. The earth isn't really littered with bodies, and I'd give this answer no credit.

Re: [2012-01-15] hmm

PostPosted: Wed Jan 16, 2013 2:49 am
by Peon

Re: [2012-01-15] hmm

PostPosted: Wed Jan 16, 2013 3:29 am
by GUTCHUCKER
I'd like to think that we all died during a .

Re: [2012-01-15] hmm

PostPosted: Wed Jan 16, 2013 4:07 am
by Apocalyptus
I never get tired of seeing pages of pedantry all about the underlying scientific principles of one not very funny joke, no matter how many times I see it.

No, sirree.

Re: [2012-01-15] hmm

PostPosted: Wed Jan 16, 2013 5:51 am
by Soliloquy

Re: [2012-01-15] hmm

PostPosted: Wed Jan 16, 2013 12:05 pm
by Mcof

Re: [2012-01-15] hmm

PostPosted: Wed Jan 16, 2013 1:28 pm
by nobody
Image

Re: [2012-01-15] hmm

PostPosted: Fri Jan 18, 2013 3:45 am
by Apocalyptus
Thank you.