Odpowiedzi

2009-12-08T21:00:20+01:00
M = 0,25kg
Δt = 100 - 20 = 80st
P = 1000W
c = 4200 J/K*kg
t = ?

P = Q/t => t = Q/P
Q = c * m * Δt

t = c * m * Δt / P = 4200 * 0,25 * 80 / 1000 = 84s