Date: Sat, 11 May 2002 07:14:47 -0400

Author: Dick Heckathorn

Subject: RE: "Radar" BAseball

Post:

Greetings

I have not seen any lately. Fifteen to twenty years ago I was able to
buy two baseballs that would give the time from when you released the
ball until it would hit the floor or table. They were great for timing
the drop for a given distance. The batteries went dead after awhile.
Took time to cut the stitches, insert a new battery and sew it up again.
But it still works.

I have my students calculate the acceleration of the hammer on the moon
from a video that I have using a stopwatch. I then drop a hammer (here
on earth!!!) and they time and calculate the acceleration. (Get a range
of times due to reaction time.) To verify their results, I drop the
baseball.

Dick

"Science is nothing more than learning how to communicate with nature in
such a manner that it will talk back."

Helping teachers who facilitate, motivating students who learn.
Dick Heckathorn 14665 Pawnee Trail Middleburg Hts, OH 44130
440-826-0834
Physics Teacher CVCA 4687 Wyoga Rd Cuyahoga Falls, OH 44224
330-929-0575 VM 120


-----Original Message-----
From: owner-tap-l@listproc.appstate.edu
[mailto:owner-tap-l@listproc.appstate.edu] On Behalf Of George M. Caplan
Sent: Friday, May 10, 2002 9:40 PM
To: tap-l@listproc.appstate.edu
Subject: "Radar" BAseball

I was in a gift shop today. (Mother's Day is Sunday -- don't forget.)
Someone came in looking for a "radar baseball".
The store had one. It measures the speed at which it is thrown.
The package says "displays speed on impact" -- certainly not radar. It
was
priced at $22.95.
Have any of you seen one of these? Have you ever used one in an
experiment
or demo?

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