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Snaga

Snaga. Srednja snaga:. Trenutačna snaga:. [W = J s -1 ]. Primjer: Kojom brzinom dizalica podiže teret mase 2 t, ako je njezina snaga 4 kW?. Rješenje:. m = 2 t. = 2000 kg. P = 4 kW. = 4000 W. v = ?. P = Fv. P = mgv . v = 0,2 m s -1. Korisnost.

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Snaga

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  1. Snaga Srednja snaga: Trenutačna snaga: [W = J s-1]

  2. Primjer: Kojom brzinom dizalica podiže teret mase 2 t, ako je njezina snaga 4 kW? Rješenje: m = 2 t = 2000 kg P = 4 kW = 4000 W v = ? P = Fv P = mgv  v = 0,2 m s-1

  3. Korisnost

  4. Primjer: Motor dizalice ima snagu 10 kW. Na koju visinu dizalica može podići teret mase 4 t za pola minute ako je korisnost 90 %? Rješenje: Pu = 10 kW = 10000 W m = 4 t = 4000 kg t = 0,5 min = 30 s  = 90 % = 0,90 h = ? , h = 6,88 m

  5. Zadatak: Motor koji služi za vuču vozila ima snagu 20 kW. Kojom brzinom motor vuče vozilo mase 500 kg po horizontalnoj podlozi ako je faktor trenja 0,4, a korisnost 90 %? Rješenje: = 20000 W Pu = 20 kW m = 500 kg  = 0,4  = 90 % = 0,90 v = ? v = 9,2 m s-1

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