New Mexicans for Science and Reason
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WHEN ARE PUZZLES UPDATED?
Since they are tied to our hard-copy newsletter and monthly meetings, look for Puzzle Updates, usually on the Friday before the Second Wednesday of each Month!
Next Puzzle Posting: September 5th (or so), 2014
August 2014 PUZZLE - "The Physicist's Spouse"
Submitted by Dave Thomas
A physicist's spouse used a wheelchair, and this was firmly hooked to latches on the van's floor during excursions. The physicist wanted to minimize accelerations and decelerations while driving, as these were uncomfortable for his passenger. As they were cruising along at 12 meters/second (~27 mph), a red light turned on at the stop bar of the next intersection, a mere six meters away.
The August Bonus:Assuming the physicist applied constant brake pressure during the stop, and reduced the van's speed to zero just as it reached the stop bar, what was the time τ for the braking maneuver? And what was the constant acceleration ao required?
Hall of Fame (August Puzzle Solvers):