Odpowiedzi

2010-01-09T11:20:31+01:00
V= 30 m^3
s=h= 6 m
t = 1h=3600 s
d= 1500 kg/m^3
g=10 m/s^2
P=?
P= W/t
W = F*s ; F= m*g
W = m*g*s ; m obl. z wzoru na gęstość : d=m/V ; m= d*V
W = d*v*g*s

P = d*V*g*s/t

P = 1500 kg/m^3 * 30 m^3*10 m/s^2*6m/3600 s
P = 2700000 N*m/3600 s ; [N*m]=[J] ; [J/s]=[W]
P = 750 W