Odpowiedzi

Najlepsza Odpowiedź!
2010-03-30T20:15:20+02:00
1.
E = ?

v = 180 km/h = 50 m/s
m = 1,5 t = 1500 kg
h = 100m

E = Ek + Em = mv2/2 + mgh
E = 1500*2500/2 + 1 500 000 = 3 375 000 J = 3,375 MJ

2.
P = 12 kW = 12000 W
W = 30 J
t =?

P = W/t
t = W/P = 30/12000 = 0,0025 s