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    blackerror_'s Avatar
    blackerror_ Posts: 1, Reputation: 1
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    #1

    Apr 12, 2019, 12:26 AM
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    A piece of metal is heated to 428 degree celsius before it is left to cool. The temperature of the metal falls at a rate of 23 degree celsius per minute for the first 3 minutes, at a rate of 15 degree celsius per minute for the next 15 minutes and then at a rate of 8 degree celsius per minute until it reaches room temperature of 25 degree celsius. Find the temperature of the metal after 9 minutes.
    Curlyben's Avatar
    Curlyben Posts: 18,464, Reputation: 1857
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    #2

    Apr 12, 2019, 12:34 AM
    What do YOU think.
    While we're happy to help we wont do all the work for you.
    ma0641's Avatar
    ma0641 Posts: 15,681, Reputation: 1012
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    #3

    Apr 12, 2019, 01:14 PM
    Draw a graph. You know the rate and time. Very easy.

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