Roboguru

Dua benda A dan B masing - masing 2 kg dan 3 kg di...

Dua benda A dan B masing - masing 2 kg dan 3 kg dihubungkan dengan tali melalui katrol seperti gambar left parenthesis straight g equals 10 space ms to the power of negative 2 end exponent right parenthesis!

Jika lantai dan gesekan antara tali dengan katrol diabaikan, dan B bergerak turun, maka besar tegangan tali T adalah....

  1. 10 N

  2. 12 N

  3. 15 N

  4. 20 N

  5. 28 N

Jawaban:

Gunakan hukum II Newton : 
sum straight F equals sum ma  straight a equals fraction numerator sum straight F over denominator sum straight m end fraction equals space fraction numerator straight w subscript straight B minus straight f subscript straight A over denominator straight m subscript straight A plus straight m subscript straight B end fraction  straight a equals fraction numerator left parenthesis 3 right parenthesis left parenthesis 10 right parenthesis minus 0 right parenthesis over denominator left parenthesis 2 plus 3 right parenthesis end fraction  straight a equals fraction numerator left parenthesis 30 minus 0 right parenthesis over denominator 5 end fraction  straight a equals 30 over 5  straight a equals 6 space straight m divided by straight s squared
 
Untuk mencari besar tegangan tali T kita tinjau benda B, 

sum straight F subscript straight B equals straight m subscript straight B straight a  straight T minus straight w subscript straight B equals straight m subscript straight B left parenthesis negative straight a right parenthesis  straight T equals straight w subscript straight B minus straight m subscript straight B straight a  straight T equals straight m subscript straight B left parenthesis straight g minus straight a right parenthesis  straight T equals left parenthesis 3 right parenthesis left parenthesis 10 minus 6 right parenthesis  straight T equals 12 space straight N

0

Ruangguru

RUANGGURU HQ

Jl. Dr. Saharjo No.161, Manggarai Selatan, Tebet, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12860

Coba GRATIS Aplikasi Ruangguru

Produk Ruangguru

Produk Lainnya

Hubungi Kami

Ikuti Kami

©2021 Ruangguru. All Rights Reserved