Supiyanto Kelas X Evaluasi Bab 3 Nomor 15

Perhatikan gambar berikut.

15

Kecepatan anguler roda A adalah 10 rad/s. Jika {{R}_{A}}:{{R}_{B}} = 2 : 1, maka kecepatan anguler roda B adalah …

A. 5 rad/s D. 40 rad/s
B. 10 rad/s E. 80 rad/s
C. 20 rad/s

Penyelesaian

Kecepatan linear roda A = kecepatan linear roda B

{{\text{v}}_{\text{A}}}={{\text{v}}_{\text{B}}}

{{\text{ }\!\!\omega\!\!\text{ }}_{\text{A}}}{{\text{R}}_{\text{A}}}={{\text{ }\!\!\omega\!\!\text{ }}_{\text{B}}}{{\text{R}}_{\text{B}}}

{{\text{ }\!\!\omega\!\!\text{ }}_{\text{B}}}={{\text{ }\!\!\omega\!\!\text{ }}_{\text{A}}}\times \frac{{{\text{R}}_{\text{A}}}}{{{\text{R}}_{\text{B}}}}=10\times \frac{2}{1}=20\text{ }\!\!~\!\!\text{ rad}/\text{s}

 

Jawaban C

Supiyanto. 2006. FISIKA UNTUK SMA KELAS X. Jakarta: Phiβeta.

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