[Blindmath] physics/mathematics problem; have a solution?

[Amanda Lacy]

I have one...Could I estimate the amount of force it would take for my 
patella to make a very audible "Crack!" on a hard tile floor or estimate the 
decibel level if I knew the force and the materials involved? Thankfully I 
haven't broken anything, unlike my sighted brother.

Amanda
----- Original Message ----- 
From: "Steve Jacobson" <steve.jacobson at visi.com>
To: "Blind Math list for those interested in mathematics" 
<blindmath at nfbnet.org>
Sent: Monday, December 19, 2011 8:39 AM
Subject: Re: [Blindmath] physics/mathematics problem; have a solution?


> It sounds to me as though the real question is whether the mass is all 
> right and whether the mass has decent medical
> coverage.  <smile>  It is my quite nonscientific observation that for each 
> time we do something that perhaps painfully
> stretches our limits as well as other parts of our body, there are ten 
> times we have succeeded at doing something
> others thought we couldn't do.
>
> Best regards,
>
> Steve Jacobson
>
> On Sun, 18 Dec 2011 21:14:00 -0800, David Engebretson Jr. wrote:
>
>>Physics problem - have a solution?:
>
>>Imagine a 68" object with a mass of 170 pounds travelling at 2.5 miles per 
>>hour (assume the mass is evenly
> distributed in the object in motion). The mass drops four feet and all of 
> the momentum and other forces are placed in a
> single point on the object at 4 feet. Assume, also, that the bottom of the 
> mass lands at the bottom of the four foot hole
> at the same time the impact upon the mass is inflicted upon the mass 
> (ignore any loss of energy due to the landing of
> the mass in the bottome of the hole - the landing and the impact are 
> ALMOST instantaneous).
>
>>What is the amount of force that the mass absorbs at the time of impact?
>
>>You can also assume the mass is 20" wide at the "point" of impact.
>
>>In summary:
>>The mass drops four feet travelling 2.5 mph. The impact area is 4 feet up 
>>from the bottom of the mass. The impact
> point is a single line 20" wide.
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