Podaj jaką moc ma silnik windy, który w czasie 5s wciąga ładunek o masie 120kg na wysokość 10m.
t = 5 s
m = 120 kg
h = 10 m
P = ?
P = W/t
W = F*s
F = Q
Q = m*g
W = m*g*s
ale s = h
W = m*g*h
P = m*g*h/t
P = 120 kg * 10 m/s² * 10 m /5s = 2400 W
Odp. Silnik windy ma moc 2400 W.
P=W/t
P=?
W=120kg=1200N
t=5s
P=1200N/5s=240W
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t = 5 s
m = 120 kg
h = 10 m
P = ?
P = W/t
W = F*s
F = Q
Q = m*g
W = m*g*s
ale s = h
W = m*g*h
P = m*g*h/t
P = 120 kg * 10 m/s² * 10 m /5s = 2400 W
Odp. Silnik windy ma moc 2400 W.
P=W/t
P=?
W=120kg=1200N
t=5s
P=1200N/5s=240W