Respostas

2013-09-22T23:05:57-03:00
2- 
ΔL=Li. \alpha .ΔT
ΔL=30.16. 10^{-6} .40
ΔL=19200. 10^{-6}
ΔL= 19200. 10^{-6+4} [/tex ΔL= 1,92.[tex] 10^{-2}


3-
100.000=33.B.30
100.000=990
 \frac{100.000}{990} = \frac{1. 10^{-5}}{99. 10^{-1}  }  =1. 10^{-5-1} = 1. 10^{-6}


4- 
Ti= -5°c
Tf= 35°c (obs: vai ser o tf-ti= 35-5=30)
Li=300m
 \alpha = 11. 10^{-6}

ΔL=Li. \alpha .ΔT
ΔL=300.11. 10^{-6}
ΔL=99000. 10^{-6}
ΔL=99000. 10^{-6+4} (obs: desloca a virgula)
ΔL=9,9. 10^{-2}



6-
ΔL=Li. \alpha .ΔT
ΔL=50.1,2. 10^{-5}  .100
ΔL=600000. 10^{-5}
ΔL=6.10

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