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PR . 3 ( 3 0 P ) Ba lang ta 4 5 0 C s cakl kta olan 8 c m kal nl ndaki

PR.3(30P)Balangta 450C scaklkta olan 8cm kalnlndaki metal blok aniden 350C
scaklkta bir ortama alnmtr. Yzeylerde film katsays1200Wm20C olduuna gre,Fo>0.2
varsayarak,
a) Plaka eksen scaklnn 355C'ye dmesi iin geen sreyi,
b) Bu sre sonunda plakann yzeyindeki scakl1,
c) Bu sre zarfinda plakadan kaybolan 1 siy hesaplaynz.
kplaka=192WmC,=8.410-5m2s,c=896JkgC,=2700kgm3
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