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visits member for 3 years, 5 months
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Started programming on a ZX spectrum in the 80's and have moved through Assembly, Turbo Pascal, C++, C#, Fortran. My main area of focus is engineering and scientific computing like numerical methods and 3D graphics.


Apr
11
answered Describing a motion of gyroscope with gimbal
Apr
11
comment How long does it take for an electric car to go from 0 to 60 mph?
You can get $x(v)=\int \frac{v}{a}\,{\rm d}v$, but you wont be able to invert it I think. Try it.
Apr
10
comment How long does it take for an electric car to go from 0 to 60 mph?
@jumpjack read the FAQ on homework type questions. No complete answers are not allowed.
Apr
9
comment How long does it take for an electric car to go from 0 to 60 mph?
I gave you the tools to do the work yourself. This is how this site works. As far as torque goes, no manufacturers give torque at engine/flywheel always.
Apr
9
comment How long does it take for an electric car to go from 0 to 60 mph?
See now? I have been telling you for days, that this is the correct way of doing it. In your case you may need simulate small speed increments and calculate time and distance from there. Kind of like an numerical ODE solver.
Apr
9
comment How long does it take for an electric car to go from 0 to 60 mph?
$E = P t$ is wrong since $P$ is not constant. It is $E = \int P dt$ stated correctly.
Apr
9
comment How long does it take for an electric car to go from 0 to 60 mph?
$a = \frac{dv}{dt} \} dt = \frac{1}{a} dv \} t = \int dt$ It is not wrong, it is called direction integration. Look it up.
Apr
9
comment How long does it take for an electric car to go from 0 to 60 mph?
You are using torque and engine, and wheel radius. You need to transfer the torque to the wheels. You need gearing information (I do not suppose it is a direct drive). Use $T=\frac{P}{v} r$ to get torque at wheel and $gear = \frac{T}{T_{engine}}$.
Apr
9
comment Hanging a brick free over an edge by stacking them
Yes for only one brick over the purple one $F=\frac{1}{2}W$, but I was calculating when four bricks are over the purple one (7 total).
Apr
9
answered Hanging a brick free over an edge by stacking them
Apr
9
comment Hanging a brick free over an edge by stacking them
The total center of mass, has to be within the edge, so as you build out, you have to build inside also.
Apr
9
comment Hanging a brick free over an edge by stacking them
+1 for taking things a step further. I challenged myself with the same problem a few years back.
Apr
9
revised How long does it take for an electric car to go from 0 to 60 mph?
added 170 characters in body
Apr
9
comment How long does it take for an electric car to go from 0 to 60 mph?
Ok see the appendix in my answer.
Apr
9
revised How long does it take for an electric car to go from 0 to 60 mph?
added 963 characters in body
Apr
8
comment How long does it take for an electric car to go from 0 to 60 mph?
Must be a unit error somewhere. Make sure you have combined density, area and speed correctly for drag, and that you use the correct torque values (at engine vs. at wheel) depending on what you want. When I run the Renault it gave me 0-60 of 9.5sec instead of 8.0 you mentioned. That is pretty close for me.
Apr
7
comment How long does it take for an electric car to go from 0 to 60 mph?
@jumpjack great toruqe curve. Do you have any idea what the top speed is for a Pegeot Zoe?
Apr
7
comment How long does it take for an electric car to go from 0 to 60 mph?
So off the line there is constant torque (Case 1) up to 36 km/h and then constant power (Case 2) beyond that.
Apr
7
awarded  Pundit
Apr
7
comment Collision of two balls of finite radius
If their distance is closer to the radii they are still under collision. You simulation needs to roll back time to before they interfered and switch their velocities using impulses.