A train can provide a power of 2MW(2 million watts) to drive the train at full speed. The resistive force on the train is then 8000 N. Calculate the maximum speed of the train.

  • 0 votes

WHAT?? i'm really stuck on this question.. any ideas??

Posted Sat 5th May, 2012 @ 13:52 by Becca

2 Answers

  • 1 vote

It can be worked out since you are given the resisting force of 8000N:- Definition is watts = N x metres/second
2000000=8000xspeed in m/s

 Just rearrange here :) 

2000000/8000=250m/s

I should just point out that there is no way that that is a GCSE question, It looks fairly A level, although we don't really go into that so much in OCR Mechanics at least 

Answered Sat 5th May, 2012 @ 14:01 by Bhavik
Edited by Bhavik on Sat 5th May, 2012 @ 14:03
  • 1 vote

thank you so much you literally just saved me from the wrath of the scariest teacher on the planet:0

Answered Sun 13th May, 2012 @ 14:57 by Becca