Supiyanto Kelas X Evaluasi Bab 3 Nomor 12

Jarum spidometer sepeda motor menunjukkan angka 1200 rpm, berarti kecepatan sudut putaran mesin motor tersebut adalah …

A. 20 rad/s D. 40 \text{ }\!\!\pi\!\!\text{  }\!\!~\!\!\text{ rad}/\text{s}
B. 20 \text{ }\!\!\pi\!\!\text{  }\!\!~\!\!\text{ rad}/\text{s} E. 60 rad/s
C. 40 rad/s

Penyelesaian

Kecepatan sudut

\text{ }\!\!\omega\!\!\text{ }=1200\text{ }\!\!~\!\!\text{ rpm}=1200\text{ }\!\!~\!\!\text{ rotasi }\!\!~\!\!\text{ per }\!\!~\!\!\text{ menit}=1200\text{ }\!\!~\!\!\text{ rotasi}/\text{menit}

\text{ }\!\!\omega\!\!\text{ }=1200\frac{\text{rotasi}}{\text{menit}}=1200\times \frac{2\text{ }\!\!\pi\!\!\text{  }\!\!~\!\!\text{ rad}}{60\text{ }\!\!~\!\!\text{ detik}}=40\text{ }\!\!\pi\!\!\text{  }\!\!~\!\!\text{ rad}/\text{s}

 

Jawaban D

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

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