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Suatu gelombang bunyi merambat dari salah satu uju...

Suatu gelombang bunyi merambat dari salah satu ujung pada batang baja dengan panjang 50 cm. Jika batang baja tersebut memiliki modulus elastisitas sebesar 2 comma 0 cross times 10 to the power of 10 space Pa dan massa jenis 5000 space kg divided by straight m cubed, berapakah waktu yang dibutuhkan gelombang bunyi untuk melintasi batang besi tersebut?space

Jawaban:

Diketahui :

table attributes columnalign right center left columnspacing 0px end attributes row calligraphic l equals cell 50 space cm equals 0 comma 5 space straight m end cell row E equals cell 2 comma 0 cross times 10 to the power of 10 space text Pa end text end cell row rho equals cell 5000 space kg divided by straight m cubed end cell end table 

Ditanya :

t = ....?

Jawab :

Soal ini kita selesaikan menggunakan rumus cepat rambat bunyi pada medium zat padat :

table attributes columnalign right center left columnspacing 0px end attributes row v equals cell square root of E over rho end root end cell row cell calligraphic l over t end cell equals cell square root of E over rho end root end cell row cell fraction numerator 0 comma 5 over denominator t end fraction end cell equals cell square root of fraction numerator 2 comma 0 cross times 10 to the power of 10 over denominator 5000 end fraction end root end cell row cell fraction numerator 0 comma 5 over denominator t end fraction end cell equals cell square root of fraction numerator 2 comma 0 cross times 10 to the power of 7 over denominator 5 end fraction end root end cell row cell fraction numerator 0 comma 5 over denominator t end fraction end cell equals cell square root of fraction numerator 20 cross times 10 to the power of 6 over denominator 5 end fraction end root end cell row cell fraction numerator 0 comma 5 over denominator t end fraction end cell equals cell square root of 4 cross times 10 to the power of 6 end root end cell row cell fraction numerator 0 comma 5 over denominator t end fraction end cell equals cell 2 cross times 10 cubed end cell row t equals cell fraction numerator 0 comma 5 over denominator 2 cross times 10 cubed end fraction end cell row t equals cell 500 over 2 end cell row t equals cell 250 space straight s end cell end table 

Jadi, waktu yang di butuhkan selama 250 sekon.

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