Re: [Phys-l] amazing golf shot

[brian whatcott <betwys1@sbcglobal.net>]

Suppose a 200 lb  man offers a cross section of six square feet when falling
 at his terminal speed of 120 mph.

Suppose air drag is  proportional to his cross section times the speed 
squared.

Air drag on a golf ball of say 2 in diameter from a 5mph zephyr would 
represent about
1/(36X6)   sq ft   X    5X5/(120X120)    X  200lb   Hmmm...about a gram.
That would bend a blade of grass.

I never saw a crowd's roar bend a blade of grass.

Brian W

On 3/7/2011 10:12 PM, Mike Viotti wrote:
> Possible?  Maybe...someone might do some envelope calculations and compare
> crowd vibrations to a 5mph wind to see a relative impact.
>
> On Mon, Mar 7, 2011 at 9:08 PM, Anthony Lapinski
> <Anthony_Lapinski@pds.org>wrote:
>
> > A student sent me this clip of an incredible chip shot by Tiger Woods.
> >
> > http://www.youtube.com/watch?v=I1I55z-x6zc
> >
> > The huge crowd cheered as the ball approached the hole, and the student
> > asked me if sound affected the ball near the cup. I had never seen this
> > clip before and had to watch it several times. It appears that the ball
> > always has momentum.
> >
> > I am now wondering -- as my student did: If the ball really did stop
> > momentarily, could longitudinal sound vibrations from the nearby roaring
> > crowd shake the ground enough to slightly move the ball into the hole?