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Selembar baja pada suhu  memiliki ukuran seperti p...

Selembar baja pada suhu begin mathsize 12px style 20 degree straight C end style memiliki ukuran seperti pada gambar. Jika koefisien muai panjang baja begin mathsize 12px style 10 to the power of negative 5 end exponent space degree straight C to the power of negative 1 end exponent end style maka pertambahan luas pada suhu begin mathsize 12px style 60 degree straight C end style adalah ....

  1. 0 comma 08 space cm squared

  2. 0 comma 16 space cm squared

  3. 0 comma 24 space cm squared

  4. 0 comma 36 space cm squared

  5. 0 comma 64 space cm squared

Jawaban:

straight alpha equals 1 cross times 10 to the power of negative 5 end exponent space divided by to the power of 0 straight C  straight A subscript 0 equals straight p subscript 0 cross times straight l subscript 0 equals left parenthesis 40 cross times 20 right parenthesis equals 800 space cm squared  increment straight T equals 60 minus 20 equals 40 degree straight C

Maka space pertambahan space luas space plat space adalah space colon  increment straight A equals straight A subscript 0 cross times straight beta cross times increment straight T  increment straight A equals straight A subscript 0 cross times 2 straight alpha cross times increment straight T  increment straight A equals left parenthesis 800 right parenthesis cross times left parenthesis 2 cross times 10 to the power of negative 5 end exponent right parenthesis left parenthesis 40 right parenthesis  increment straight A equals 0 comma 64 space cm squared

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