help help 9 physics) i need an aswer fast!

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a 0.5 m^2 solar collector radiation from the sun and focuses it on 250g of water that is inially at 23 degrees . the average intensity of radiation arriving from the sun at this location is 550 Wm^-2. if you assume that this is collected with 100% efficiency. how much time is required for the collector to raise this temperatuer to boiling, at 100 degrees

  • help help 9 physics) i need an aswer fast! -

    Are you taking a test?

  • help help 9 physics) i need an aswer fast! -

    lol, no me and my friends how homework and we all ( 5 of us) don't get this question. !!

  • help help 9 physics) i need an aswer fast! -

    figure the heat from the sun:

    intensity*area*time

    set that equal to masswater*specificheatwater*changeinTemp.

    Five friends? This is a an easy question, get new smarter friends.

  • help help 9 physics) i need an aswer fast! -

    haha, your just too smart =)
    thanx

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