Physics Help Forum Working out power.
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 Sep 30th 2010, 01:22 PM #1 Junior Member   Join Date: Sep 2010 Posts: 7 Working out power. Ive been given a question about power. Weve done it at school and im revising it at home before next lesson. I hope you can help me. Im really confused. The infomation that I am given is; Model: BMW 3 series, Diesel, 2 litre engine Top speed: 204Km/h 0 - 100Km/h: 10.6 seconds Max Power: 90 Kw Mass: 1655Kg (Including 150kg passengers) I know the method on how to solve this but I cannot do one of the calculations. The calculation that im stuggling with is finding out the Velocity. All I can think of doing is: 0 - 100 Km/h in 10.6 seconds. = 0 - 100,000m/h in 10.6 seconds = 0 - 27.78m/s in 10.6 seconds 27.78 divided by 10.6 = 2.62m/s/s But with this answer when I use it in the formula for acceleration, it doesnt give me the same value my teacher worked out. I could be doing this completly wrong. Please help. Many thanks Steve
 Sep 30th 2010, 03:52 PM #2 Senior Member   Join Date: Mar 2010 Location: Lithuania Posts: 105 Please write your formula and how you use it.
 Oct 1st 2010, 07:36 AM #3 Junior Member   Join Date: Sep 2010 Posts: 7 Ohhh Ive figured it out. After you find velocity i use. a = (V - U) divided by Time then Force = Mass X Acceleration Work done = Force X Distance Distance = (U + V) Divided by 2 X Time Power = Work done Divided by Time
 Oct 2nd 2010, 07:27 AM #4 Member   Join Date: Nov 2008 Location: PAKISTAN Posts: 79 Hello steve, u seems to be doing correct,except may be some calculator error, if i m not wrong. i suppose. Are you using calculator for calculating distance,i.e. take care of the calculation again.

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