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tlng no 13&14 pakai cara......
tlng no  13&14 pakai cara......

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  • 13) m = 0,75 kg
    Q1 = m c air. (100-20)
    = 0,75. 4200. 80
    = 252.000 J
    = 252 kj

    Q2 = m. U
    = 0,75. 2270 kj/kg
    = 1702,5 kj

    Q = Q1 + Q2
    = 252 + 1702,5
    = 1954,5 kj

    14) Q = mc^T + m.U
    6,2.10^6 = 5.4200.(100-20) + m. 2,27.10^6

    6,2.10^6 = 1,68.10^6 + m.2,27.10^6
    6,2 = 1,68 + m. 2,27

    m.2,27 = 6,2-1,68
    = 4,52
    m = 4,52/2,27
    = 2 kg