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Pertanyaan

Uang logam bermassa 50 gram dicelupkan ke dalam 50 gram air bersuhu begin mathsize 14px style 29 comma 8 space degree straight C end style. Diketahui kalor jenis air begin mathsize 14px style 1 space kal divided by straight g space degree straight C end style dan kalor jenis logam begin mathsize 14px style 0 comma 15 space kal divided by straight g space degree straight C end style. Jika suhu campuran saat mencapai kesetimbangan adalah begin mathsize 14px style 37 space degree straight C end style, suhu mula – mula uang logam adalah ….

  1. begin mathsize 14px style 25 space degree straight C end style   

  2. begin mathsize 14px style 77 space degree straight C end style   

  3. begin mathsize 14px style 85 space degree straight C end style  

  4. begin mathsize 14px style 87 space degree straight C end style   

  5. begin mathsize 14px style 45 space degree straight C end style   

F. Noor

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

Pembahasan

Diketahui:
begin mathsize 14px style m subscript l o g a m end subscript equals 50 space straight g m subscript a i r end subscript equals 50 space straight g T subscript a i r end subscript equals 29 comma 8 space degree straight C T subscript s equals 37 space degree straight C c subscript l o g a m end subscript equals 0 comma 15 space kal divided by straight g space degree straight C c subscript a i r end subscript equals 1 space kal divided by straight g degree straight C T subscript c equals 37 to the power of o C end style   

Ditanya:
begin mathsize 14px style T subscript L equals ? end style  

Berdasarkan asas black,

begin mathsize 14px style Q subscript l e p a s end subscript equals Q subscript t e r i m a end subscript end style   

logam akan melepas kalor karena suhunya lebih tinggi, sedangkan air akan menerima kalor karena suhunya lebih rendah. Maka,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell m subscript l o g a m end subscript space c subscript l o g a m end subscript space capital delta T end cell equals cell m subscript a i r end subscript space c subscript a i r end subscript space capital delta T end cell row cell m subscript l o g a m end subscript space c subscript l o g a m end subscript space open parentheses T subscript L minus T subscript s close parentheses end cell equals cell m subscript a i r end subscript space c subscript a i r end subscript space open parentheses T subscript s minus T subscript a i r end subscript close parentheses end cell row cell up diagonal strike left parenthesis 50 right parenthesis end strike left parenthesis 0 comma 15 right parenthesis left parenthesis T subscript L minus 37 right parenthesis end cell equals cell up diagonal strike left parenthesis 50 right parenthesis end strike left parenthesis 1 right parenthesis left parenthesis 37 minus 29 comma 8 right parenthesis end cell row cell 0 comma 15 T subscript L minus 5 comma 55 end cell equals cell 7 comma 2 end cell row cell 0 comma 15 T subscript L end cell equals cell 7 comma 2 plus 5 comma 55 end cell row cell 0 comma 15 T subscript L end cell equals cell 12 comma 75 end cell row cell T subscript L end cell equals cell fraction numerator 12 comma 75 over denominator 0 comma 15 end fraction end cell row cell T subscript L end cell equals cell 85 space degree straight C end cell end table end style   

Jadi, jawaban yang tepat adalah C.

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Jawaban terverifikasi

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