Răspuns:
to=0°C= 273,15°K
l=lo(1+αΔt)
a)l=60(1+17*10⁻⁶(253-273))=60(1+1710⁻⁶*(-20))=
60(1+17*2*10⁻⁵)=60(1-17*0,00002)=
60(1-00034)=60*0,00066...= faci inmultireatu pe calculator
b)l `=60(1+17*10⁻⁶(313-273))=60(1+17*10⁻⁶*40)=
60(1+68*10⁻⁵)=
60(1+0,00068)=
60*1,00068m
Explicație:
