Které fyzikální veličině odpovídá jednotka o rozměru m · s−2?
Správná odpověď je: A
Rozměr fyzikální jednotky dané veličiny lze zjistit ze vzorce pro tuto veličinu. Zrychlení lze vypočítat například ze vzorce pro rychlost jako , pro jeho jednotku tedy bude platit:
[a] = m · s−1/s = m · s−2.
Hybnost lze vypočítat ze vzorce , jednotkou hybnosti je tedy:
[p] = kg · m · s−1.
Rychlost lze vypočítat jako , jednotkou je tedy:
[v] = m · s−1.
Sílu lze vypočítat podle vzorce , jednotkou síly je newton (N) s rozměrem:
[F] = N = kg · m · s−2.
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