Roboguru

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

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

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

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

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

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

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

Jawaban:

R subscript A equals space 0 R subscript B equals space 25 c m space equals space 0 comma 25 space m m subscript a equals space 200 g equals 0 comma 2 k g m subscript b equals space 400 g equals 0 comma 4 k g

Coba perhatikan letak sumbu putarnya. Maka :

capital sigma I equals space I subscript 2 plus I subscript 1 capital sigma I equals space m subscript a R subscript A squared plus space m subscript b R subscript B squared capital sigma I equals space 0 space plus space left parenthesis 0 comma 4 right parenthesis space left parenthesis 0 comma 25 right parenthesis squared capital sigma I equals space 0 comma 025 space k g. m squared capital sigma I equals space 25 cross times 10 to the power of negative 3 end exponent k g. m squared

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