Dobrý den, potřeboval bych pomoct s příkladem, který zní:
Vypočítej hmotnost plastové trubky délky 4 m s vnějším průměrem 14 cm a vnitřním průměrem 13,4 cm, pakliže ρ = 1050kg/m3.
Zkusil jsem to spočítat a vyšlo mi 5,54 kg, ale nejsem si tím vůbec jistý.
Děkuji
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