New world record with an electric racing car: From 0 to 100 in 0.956 seconds

Post by lambdasquirrel » Wed, Sep 13, 2023, 3:36 AM UTC

pixl97 wrote: post #252

jameshart wrote: post #246

Earlier quoted context omitted.

Something weird about this is that humans very often ascribe the sensation of d^ns/dt^n, to feeling d^n-1s/dt^n-1. So people will say that something which accelerates quickly is 'fast'. Or they will say, when they feel themselves initially being pressed back into their seat as a plane starts its takeoff roll, that they are experiencing 'acceleration' when what they are experiencing is actually jerk. The thing is, you…

>The thing is, you can't actually feel motion at a constant speed In a vacuum. If you roll the window down, or if the atmosphere starts ablating you into a hot plasma then you may realize you're going very fast.

Post by kQq9oHeAz6wLLS » Wed, Sep 13, 2023, 3:46 AM UTC

vvanders wrote: post #237

qup wrote: post #226

Earlier quoted context omitted.

You might be the only person on the planet who's witnessed several of those, if you mean first-hand.

They're still incredibly dangerous. Even with all the safety guards you've got 50-300hp being directed to a free-space shaft. When we got a mower we went with a flail mower because we'd be mowing near neighbors and a bush hog(giant lawnmower blade style mower) will happily pick up a rock and send it with enough force to easily kill someone at a good distance. Flails tend to throw less things(which is why highway main…

Post by AmericanChopper » Wed, Sep 13, 2023, 3:58 AM UTC

anikan_vader wrote: post #123

HPsquared wrote: post #104

Earlier quoted context omitted.

Speed = ∫(acceleration) dt

Sure, but once you have speed you can use aerodynamics to get grip (e.g., F1 cars). So this is really only relevant if you need acceleration from low speed.

Post by codethief » Wed, Sep 13, 2023, 4:42 AM UTC

jameshart wrote: post #246

westurner wrote: post #211

Earlier quoted context omitted.

Derivatives of relative displacement as defined by a distance metric in a [e.g. metric tensor] space: Length = Point2 - Point1 Length * Time^-1 = Velocity or Speed Length * Time^-2 = Acceleration Length * Time^-3 = Jerk Length * Time^-4 = Snap or Jounce Length * Time^-5 = Crackle Length * Time^-6 = Pop Displacement (geometry) > Derivatives: https://en.wikipedia.org/wiki/Displacement_(geometry)#Deriva... Fourth, fifth…

Something weird about this is that humans very often ascribe the sensation of d^ns/dt^n, to feeling d^n-1s/dt^n-1. So people will say that something which accelerates quickly is 'fast'. Or they will say, when they feel themselves initially being pressed back into their seat as a plane starts its takeoff roll, that they are experiencing 'acceleration' when what they are experiencing is actually jerk. The thing is, you…

Post by uoaei » Wed, Sep 13, 2023, 5:20 AM UTC

pixl97 wrote: post #252

jameshart wrote: post #246

Earlier quoted context omitted.

Something weird about this is that humans very often ascribe the sensation of d^ns/dt^n, to feeling d^n-1s/dt^n-1. So people will say that something which accelerates quickly is 'fast'. Or they will say, when they feel themselves initially being pressed back into their seat as a plane starts its takeoff roll, that they are experiencing 'acceleration' when what they are experiencing is actually jerk. The thing is, you…

>The thing is, you can't actually feel motion at a constant speed In a vacuum. If you roll the window down, or if the atmosphere starts ablating you into a hot plasma then you may realize you're going very fast.