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h = 1,8 m
P = 2,5
t = 4 h = 14 400 s
g = 10 m/s2
szukane:
m = ?
W = Ep = m * g * h
P = W/t --> W = P * t
mgh = P*t /:gh
m = P*t/hg
m = 2,5 * 14400/(10 *1,8)
m = 2 000 kg = 2 t
Odp. Wrzucił 2 tony węgla.
P=F s / t
Pt = Fs
F=P t / s
m g = P t / s
m=P t / s g
m=2,5 x 14400 / 1,8 x 10
m=2000 kg