Modelová Otázka ID 3157 - 
Nádoba má tvar válce o poloměru 3,2 cm a tloušťce stěny 2 mm, výška nádoby je 25 cm. Za jak dlouho nádobu naplníme hadičkou při průtoku 5 cm3 · s−1?
Správná odpověď je: B, D
Objem nádoby ve tvaru válce lze vypočítat podle vzorce pro objem válce 
, kde r je vnitřní poloměr nádoby a h její výška. Vnitřní poloměr nádoby lze získat odečtením tloušťky stěny od celkového poloměru, což jsou 3 cm. Po dosazení do vzorce vyjde objem nádoby přibližně 707 cm3. Tento objem, čas a rychlost vyprázdnění jsou ve vztahu 
, kde Q je (objemový) průtok, tedy rychlost odtékání kapaliny z nádoby. Výsledkem je tedy čas přibližně 141 s, což po převodu odpovídá asi 2,36 min.
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