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a fost răspuns

o dara din nichel cu dimensiunile l=12cm L=0,8m h=10la putere-3m si temperatura initiala T1=250,15k absoarbe Q=7772,16J.Sa se afle temperatura finala a barei​

Răspuns :

Baiatul122001

l=12 cm=12*10⁻² m

ρ=8908 kg/m³

c=460 J/kgK

V=Llh=0,8*12*10⁻²*10⁻³=9,6*10⁻⁵ m³

ρ=m/V=>m=ρV=8908*9,6*10⁻⁵=0,855 kg

Q=mcΔT=>ΔT=Q/mc=7772,16/0,855*460=19,76 K

ΔT=T₂-T₁=>T₂=ΔT+T₁=19,76+250,15=269,91 K