Message-Id: <v01540b06af3380124b4c@[192.174.2.173]>
Date: Fri, 21 Feb 1997 08:39:17 -0800
To: pinhole@exploratorium.edu
From: pauld@exploratorium.edu (Paul Doherty)
Subject: Re: More science questions!
>Date: Fri, 21 Feb 1997 08:37:12 -0800
>To:mara@sirius.com (mara hill)
>From:pauld@exploratorium.edu (Paul Doherty)
>Subject:Re: More science questions!
>
>Hi Mara
>
>The sugar question is chemistry. I'll pass it on.
>
>The alarm on an alarm clock requires very little electric current to run,
>while the motor takes a lot. As the battery dies it eventually reaches a
>point where it can deliver enough current to run the alarm but not enough
>for the motor. Or also possible, the clock motor is dead or dying.
>
>Electric garage door openers transmit radio frequency signals. Which is
>why when the aircraft carriers come into San Francisco Bay, garage doors
>in the east bay go up and down. (The Navy operates radios on the same
>frequencies as garage doors.)
>
>The Joule is the correct metric system unit of energy. The Calorie is an
>older unit which survives because it has entered popular culture. 1
>Calorie = 4184 Joules. (Note 1 Calorie = 1000 calories the capital letter
>at the start makes a difference of 1000.)
>
>Hope these help.
>
>Paul Doherty