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Tyer

Maths

附加文件

解答 0

  • leung_po_chuen
    2020-09-21 00:08:01

    附加文件

  • 解數雜貨店
    2020-09-21 07:38:53
    a) When t=0, T(0) = 90 When t=∞, T(∞) = 20 ∴ T(t) is decaying b) Since T(0) = 90, she doesn’t need to wait c) T(10) = 20+70(1.7)⁻² = 44 44 is pretty close to 42. Practically, she waits the appropriate time. It makes no sense to calculate the time exactly. While she is drinking the tea, the temperature is decreasing. Wait to have the temperature dropping to around 42 is good enough.
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