The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21.0 ms

# The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21.0 ms

393k points

The electric motor of a model train accelerates the train from rest to 0.620 m/s in 21.0 ms.  The total mass of the train is 875 g.  Find the average power delivered to the train during its acceleration.

The electric
bhdrkn

389.5k points

The average power delivered to a system is equal to the amount of energy transfer over a period time,

$P=\frac{W}{t}$

The average power delivered to the train is its change in kinetic energy over the time it takes,

$P=\frac{W}{t}=\frac{\frac{1}{2}mv_f^2-\frac{1}{2}mv_i^2}{t}=\frac{\frac{1}{2}(0.875 \, kg)(0.620 \, m/s)^2-\frac{1}{2}(0.875\,kg)(0 \, m/s)^2}{0.021 \, s }=8 \, W$

Z
0 points

#### Oh Snap! This Answer is Locked

Thumbnail of first page

Filename: BSA 310 Week 2, Learning Team, Mission Statement and Company Description.doc

Filesize: < 2 MB

Print Length: 2 Pages/Slides

Words: NA

Surround your text in *italics* or **bold**, to write a math equation use, for example, $x^2+2x+1=0$ or $$\beta^2-1=0$$

Use LaTeX to type formulas and markdown to format text. See example.