UN Fisika 2016 Paket 3 Nomor 20

Sebanyak 75 gram air yang suhunya 0~{}^\circ C dicampur dengan 50 gram air, sehingga suhu campurannya 40~{}^\circ C, maka suhu awal air 50 gram adalah …

A.       125~{}^\circ C D. 100~{}^\circ C
B.        120~{}^\circ C E. 80~{}^\circ C
C.        110~{}^\circ C

Penyelesaian

Asas black.

{{Q}_{lepas}}={{Q}_{serap}}

\displaystyle {{m}_{k}}~.{{c}_{k}}~.\Delta T={{m}_{a}}~.{{c}_{a}}~.\Delta T

75\left( 40-0 \right)=50\left( t-40 \right)

3000=50T-2000

T=100~{}^\circ C

jawaban D

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