Roboguru

Dua buah bola yang dihubungkan dengan kawat (massa...

Dua buah bola yang dihubungkan dengan kawat (massa kawat diabaikan) disusun seperti gambar. Besar momen inersianya adalah ....

  1. 20 space cross times 10 to the power of negative 3 end exponent space kg. straight m squared

  2. 25 space cross times 10 to the power of negative 3 end exponent space kg. straight m squared

  3. 11 space cross times 10 to the power of negative 2 end exponent space kg. straight m squared

  4. 55 space cross times 10 to the power of negative 2 end exponent space kg. straight m squared

  5. 80 space cross times 10 to the power of negative 2 end exponent space kg. straight m squared

Jawaban:

straight R subscript straight A equals 0  straight R subscript straight B equals 25 space cm equals 0 comma 25 space straight m  straight m subscript straight A equals 200 space straight g equals 0 comma 2 space kg  straight m subscript straight B equals 400 space straight g equals 0 comma 4 space kg

Coba perhatikan letak sumbu putarnya. Maka besar momen inersianya :

sum for blank of straight I equals straight I subscript 1 plus straight I subscript 2  sum for blank of straight I equals straight m subscript straight A straight R subscript straight A superscript 2 plus straight m subscript straight B straight R subscript straight B superscript 2  sum for blank of straight I equals 0 plus left parenthesis 0 comma 4 right parenthesis left parenthesis 0 comma 25 right parenthesis squared  sum for blank of straight I equals 0 comma 025 space kg. straight m squared  sum for blank of straight I equals 25 cross times 10 to the power of negative 3 end exponent space kg. straight m squared

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