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 [DPRG] Robot math problems Message index sorted by: [ date ] [ thread ] [ subject ] [ author ] Previous message: [DPRG] Robot math problems Next message: [DPRG] Who's coming with me to the Scout Banquet? Subject: [DPRG] Robot math problems From: R. Bickle rbickle at swbell.net Date: Thu Feb 14 11:24:21 CST 2002 ```Simple Mike, The Circumference of the spherical Earth is C = 2*pi*r The difference in radii is: 12ft - 6ft = 6ft. Adding to r yields: C = 2*pi*(r+6ft) --> c = (2*pi*r) + (2*pi*6ft) The change in C is 2*pi*6ft = 37.7 feet. Rick -----Original Message----- >From: dprglist-admin at dprg.org [mailto:dprglist-admin at dprg.org]On Behalf Of Mike McCarty Sent: Wednesday, February 13, 2002 2:07 PM To: Clay Timmons Cc: dprglist at dprg.org Subject: Re: [DPRG] Robot math problems On Wed, 13 Feb 2002, Clay Timmons wrote: > > Just working out a few robot navigation issues > and thought I'd share a couple math problems > I've encountered. Have fun! Took me about > 10 minutes. Really? Ten minutes? The first one is obvious, I thought. The other took about 15 seconds of thought. If these were posers, then how about this: A cable is being strung around the surface of the Earth at the equator at a height of 6 feet. After it is strung, the requirements change (don't they always?) and the cable must now be raised to 12 feet above the surface. How much additional cable must be inserted to raise the cable? (Assume the Earth is a perfect sphere.) > > If a 12" wide robot with 3" diameter wheels > has one wheel going 1/2 the speed of the other > it will go in a circle. > > 1) What diameter is that circle? > > 2) To make the robot go in a circle with > a 9" radius on the inside wheel > what speed should the inside wheel > go as a percentage of the outside wheel? > > > I have solutions and will post answers next week. Mike _______________________________________________ DPRGlist mailing list DPRGlist at dprg.org http://nimon.ncc.com/mailman/listinfo/dprglist ``` Previous message: [DPRG] Robot math problems Next message: [DPRG] Who's coming with me to the Scout Banquet? Message index sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the DPRG mailing list