UN Fisika 2016 Paket 3 Nomor 18

Bejana dari baja berukuran 10 liter diisi penuh dengan air bersuhu 25 {}^\circ C, kemudian dipanaskan hingga suhu mencapai 75 {}^\circ C. Bila koefisien muai volume baja 3,3\times {{10}^{-5}}~{}^\circ {{C}^{-1}} dan koefisien muai volume air =2,1\times {{10}^{-4}}~{}^\circ {{C}^{-1}}, maka volume air yang tumpah adalah …

A.    0,0165 liter D. 0,1050 liter
B.     0,0558 liter E. 0,8850 liter
C.     0,0885 liter

Penyelesaian

Saat dipanaskan, wadah memuai begitu juga air.

 

Pemuaian volume wadah baja

\text{ }\!\!\Delta\!\!\text{ }V={{V}_{0}}~.\gamma ~.\text{ }\!\!\Delta\!\!\text{ }T

\text{ }\!\!\Delta\!\!\text{ }V={{V}_{0}}~.3\alpha ~.\text{ }\!\!\Delta\!\!\text{ }T

\text{ }\!\!\Delta\!\!\text{ }V=\left( 10 \right)~\left( 3,3\times {{10}^{-5}} \right)~.(50)

\text{ }\!\!\Delta\!\!\text{ }V=0,0165~liter

 

Pemuaian volume air

\text{ }\!\!\Delta\!\!\text{ }V={{V}_{0}}~.\gamma ~.\text{ }\!\!\Delta\!\!\text{ }T

\text{ }\!\!\Delta\!\!\text{ }V=\left( 10 \right)~.\left( 2,1\times {{10}^{-4}} \right)~.(50)

\text{ }\!\!\Delta\!\!\text{ }V=0,105~liter

 

Banyak air yang tumpah

0,105 – 0,0165 = 0,0885 liter

jawaban C

 

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