Re:Physicist Uses Math to Beat Traffic Ticket
by xxbondsxx on Saturday April 14, 2012 @09:52PM
(#3842501)
MechE here, electrical motors can obtain almost instantaneous acceleration / full torque at 0rpm. Their torque curves typically look like this:
http://www.jmag-international.com/catalog/img/e68-3b.gif
The brakes are independent, so it's not as if one system has to provide both accelerations, one just needs exceptional timing of the feet. A lot of rally car drivers can do similar maneuvers
This is the same reason why the Tesla Roadster has such a killer 0-40mph
He claims in his model, 'his car decelerated at - 10 m/s^2 and, instantaneously, accelerated to + 10 m/s^2 at t = 0'.
No known mechanical system is capable of achieving such an instantaneous jump without a tail-off period. ...."