Spin Speed--How fast is fast enough?

[passatdoc]

San Francisco historically had a very large Italian community. The Bank of Italy helped the city to rebuild after the 1906 Earthquake.

My hometown of San Diego has a Little Italy but not as large as North Beach. The original immigrants were mostly fisherman di Napoli.

There is still a church there con missa en italiano la dominica primera della messa. (black dresses not included).

http://www.olrsd.org/
http://www.olrsd.org/services.php#
They have saints in glass boxes, just like in Italy!

http://www.littleitalysd.com/splash/index.asp

 

[dj-gabriele]

Oh my! I have yet to see a saint in a glass bottle!

 

[suburbanmd]

centrifugal force

PassatDoc, centrifugal force varies proportionally to the radius, not the square of the radius. Look at it this way: The basic formula for centripetal force is

(m * v**2) / r

where v is the velocity along the circle, and r is the radius. For a constant RPM, v varies proportionally with the radius, so v**2 varies as the square of the radius. But there's also an r in the denominator, so the result varies proportionally with the radius.