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Fitria membersihkan meja datar yang tertumpah cairan P dengan luas 35 cm 2 dan gaya sebesar 70 dyne sejajar permukaan meja pada permukaan cairan P. Jika timbul kecepatan alir fluida sebesar sebesar 5 cm/s dan koefisien viskositas cairan P tersebut adalah 2 x 10 -5 Pa.s, tebal cairan P sebesar ….

Fitria membersihkan meja datar yang tertumpah cairan P dengan luas 35 cm2 dan gaya sebesar 70 dyne sejajar permukaan meja pada permukaan cairan P. Jika timbul kecepatan alir fluida sebesar sebesar 5 cm/s dan koefisien viskositas cairan P tersebut adalah 2 x 10-5 Pa.s, tebal cairan P sebesar ….

  1. 2,5 × 10-5 m

  2. 5,0 × 10-5 m

  3. 2,5 × 10-6 m

  4. 5,0 × 10-6 m

  5. 3,5 × 10-6 m

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah D.

jawaban yang tepat adalah D.

Pembahasan

Diketahui: tebalcairan P dapat dihitung dengan persamaan viskositas, yaitu Jadi jawaban yang tepat adalah D.

Diketahui:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank A end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 35 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cm end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank squared end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 35 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative 4 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight m end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank squared end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank F end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 70 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank dyne end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 70 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative 5 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight N end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank v end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 5 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cm end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank divided by end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight s end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 5 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative 2 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight m end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank divided by end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight s end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank eta end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 2 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative 5 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank Pa end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank. end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight s end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank y end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank ? end table end style  

 

tebal cairan P dapat dihitung dengan persamaan viskositas, yaitu

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank eta end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator F over A over denominator v over y end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank eta end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator F blank y over denominator A blank v end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank y end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator eta A v over denominator F end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank y end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator left parenthesis 2 cross times 10 to the power of negative 5 end exponent right parenthesis left parenthesis 35 cross times 10 to the power of negative 4 end exponent right parenthesis left parenthesis 5 cross times 10 to the power of negative 2 end exponent right parenthesis over denominator 70 cross times 10 to the power of negative 5 end exponent end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank y end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator 350 cross times 10 to the power of negative 11 end exponent over denominator 70 cross times 10 to the power of negative 5 end exponent end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank y end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 5 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 10 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank to the power of negative 6 end exponent end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank straight m end table end style   

Jadi jawaban yang tepat adalah D.

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