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Deceleration's 100 math problems thread!; Absolute torture...
Topic Started: Aug 4 2011, 04:22 AM (5,618 Views)
Spar
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Wandering Scavenger

Not quite in that order, but that's the gist of it, yeah.
 
Brayzure
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The Analytic Commander

I hope I am right in thinking that your absence, decel, is because you are still thinking of new problems. We must get to 25!
 
Infect
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Overlord Of Fail
omg the ansewr is 4 minutes thats how long it takes for light to get to earth

that was the question right
 
Brayzure
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The Analytic Commander

First of all, that was not the question, we are waiting for one. And second, it actually takes a tad over eight minutes.
 
Deceleration
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Coreling Conquerer

SergeantRick is correct on both counts. And I am thinking of new questions, which will involve "physics".
 
Brayzure
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The Analytic Commander

Oh goodie. 2 points for me? :D
 
Deceleration
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Coreling Conquerer

No, because you didn't do any math.

Question 19
A car traveling at 28 meters per second stops over a distance of 79 meters. What is the coefficient of friction between the car and the road?
 
Brayzure
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The Analytic Commander

Is it stopping on concrete, or asphalt? As I understand, that yields different answers.

EDIT:
Assuming the surfaces are dry...
Asphalt: 0.9
Concrete: 0.7-ish
Edited by Brayzure, Oct 13 2011, 08:58 AM.
 
Deceleration
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Coreling Conquerer

How the hell did you calculate that? I gave you how far it continues to move after the brakes are applied. That distance has nothing to do with the surface.
 
Brayzure
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The Analytic Commander

I looked it up. There I said it. I had absolutely no idea what a coefficient of friction was, so I looked it up, and I found a table with coefficients of friction for common surfaces. Here:

http://www.engineeringtoolbox.com/friction-coefficients-d_778.html
 
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