Supiyanto Kelas X Evaluasi Bab 1 Nomor 9

Daya adalah usaha persatuan waktu, maka dimensi daya adalah …

A. \text{ML}{{\text{T}}^{-2}} D. {{\text{M}}^{2}}\text{L}{{\text{T}}^{-3}}
B. \text{M}{{\text{L}}^{2}}{{\text{T}}^{-2}} E. {{\text{M}}^{2}}{{\text{L}}^{2}}{{\text{T}}^{-3}}
C. {{\text{M}}^{2}}\text{L}{{\text{T}}^{-3}}

Penyelesaian

Daya P

\text{P}=\frac{\text{W}}{\text{t}}

Dimensi usaha W = \text{M}{{\text{L}}^{2}}{{\text{T}}^{-2}} (usaha = gaya x perpindahan)

Dimensi waktu t = T

Dimensi daya = \frac{\text{M}{{\text{L}}^{2}}{{\text{T}}^{-2}}}{\text{T}}=\text{M}{{\text{L}}^{2}}{{\text{T}}^{-3}}

jawaban C

 

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

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