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Δt=10,5K
Q₂=?
cw=4189,9 J/ kg×K
cw=Q / m×Δt
Q=cw×m×Δt
Q=4189,9×2×10,5
Q₁=87987,9 J
Q₁=Q₂
m=5kg
Δt=20K
Q₁=87987,9 J
cw=?
cw=Q / m×Δt
cw=87987,9 / 5×20
cw=879,9 J / kg×K
Wychodzi, że kamień jest z aluminium :D