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posted by  twotalls on 11/5/2009 1:31:27 AM  |  status: Closed  |  Earned Karma: 25

Intensity

Course Textbook Chapter Problem Needs by
Classical Physics Physical Science (7th) by Tillery N/A N/A 11/5/2009 at 11:00:00 AM
Question Details:
"for an intensity of 1kwatt/m2, how much power is required on an area of 250cm2?

I know that, IA=P which gives me 1kwatt/m2 * 250 cm2. but do I have to convert 250 cm2 to m2? I've never done any of these problems before so if you could help me out that would be great.

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posted by jerry2009 on 11/5/2009 1:36:52 AM  |  status: Live
Asker's Rating: Lifesaver   
Response Details:

    Intensity, I = 1 kwatt / m2

                           = 1000 watt / m2

    Area , A = 250 cm2

                       = 250 X 10 -4 m2
                     
    Power, P = I A

                   = 1000 watt / m2  * 250 X 10 -4 m2

                   = 25 W
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