Homework Help: physics

Posted by Anonymous on Tuesday, October 11, 2011 at 6:12pm.

The electric motor of a model train accelerates the train from rest to 0.780 m/s in 33.0 ms. The total mass of the train is 510 g. Find the average power delivered to the train during its acceleration.

physics - Henry, Wednesday, October 12, 2011 at 8:20pm
a = (Vf - Vo) / t,
a = (0.78 - 0) / 0.033s = 23.64m/s^2.

Fn = ma = 0.51 * 23.64 = 12.06N. = Net
force.

W = F*d / t = 12.06 * 0.01287 / 0.033 =
4.7J.
physics - Henry, Friday, October 14, 2011 at 10:03pm
Correction: Po = F*d/t = 4.7Watts.
physics - Anonymous, Wednesday, November 7, 2012 at 12:24pm
where did you get the value .01287 for d when calculating for work in the last step of the problem

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