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P=30[kW]=30000[W],
m=14400[kg],
h=20[m],
g=10[N/kg],
Wzór:
P=W/t;W=m*g*h,to
P=(m*g*h)/t,
Wyznaczamy t,
t=(m*g*h)/P,
Jednostka:
[t]=[(kg*(N/kg)*m)/W]=[(N*m)W]=[J/(J/s)]=[s],
Obliczenia:
t=(14400*10*20)/30000=2880000/30000=96[s],
Odp.Czas wynosi t=96[s]