Které fyzikální veličině odpovídá jednotka o rozměru kg · m2 · s−2?
Správná odpověď je: C
Rozměr jednotky příslušící dané fyzikální veličině lze určit podle vzorce pro danou veličinu. Tlak lze vypočítat podle vzorce ,
jednotku pak jako:
[p] = N/m2 = kg · m · s−2/m2 = kg · m−1 · s−2 = Pa (pascal).
Výkon lze vypočítat podle vzorce , jednotku výkonu pak jako:
[P] = J/s = J · s−1 = (kg · m2 · s−2) · s−1 = kg · m2 · s−3 = W (watt).
Práci lze vypočítat podle vzorce , pro jednotku práce pak platí vzorec:
[W] = (kg · m · s−2) · m = kg · m2 · s−2 = J (joule).
Sílu lze vypočítat dle vzorce , pro její jednotku pak platí:
[F] = kg · m · s−2 = N (newton).
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