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Perhatikan gambar! Balok A bermassa 30 kg yang ...

Perhatikan gambar!

Balok A bermassa 30 kg yang diam di atas lantai licin dihubungkan dengan balok B bermassa 10 kg melalui sebuah katrol. Balok B mula-mula ditahan kemudian dilepaskan sehingga bergerak turun. Percepatan sistem adalah .... (g = 10 begin mathsize 12px style ms to the power of negative 2 end exponent end style)

  1. 2,5 begin mathsize 12px style ms to the power of negative 2 end exponent end style

  2. 10 begin mathsize 12px style ms to the power of negative 2 end exponent end style

  3. 12 begin mathsize 12px style ms to the power of negative 2 end exponent end style

  4. 15 begin mathsize 12px style ms to the power of negative 2 end exponent end style

  5. 18 begin mathsize 12px style ms to the power of negative 2 end exponent end style

Jawaban:

straight m subscript straight A space equals space 30 space kg  straight m subscript straight B space equals space 10 space kg  straight g space equals space 10 space ms to the power of negative 2 end exponent

Berdasarkan Hukum II Newton :

straight F equals straight m. straight a  straight a equals straight F over straight m  straight a equals fraction numerator straight w subscript straight B over denominator straight m subscript straight A plus straight m subscript straight B end fraction  straight a equals fraction numerator left parenthesis 10 right parenthesis left parenthesis 10 right parenthesis over denominator 30 plus 10 end fraction  straight a equals 100 over 40  straight a equals 2 comma 5 space straight m divided by straight s squared

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