
Fisa de lucru. Calorimetrie.
Authored by Mirel Neagu
Physics
8th Grade
Used 4+ times

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1.
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3 mins • 1 pt
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Un vas conține m1=200g de apă (c1=4200 J/kgK) în care se introduce o bucată de zinc cu masa m2=600g (c2=400J/KgK). Cu câte grade se încălzește apa din pahar, dacă zincul s-a răcit cu ΔT=-70K?
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5.
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3 mins • 1 pt
Într-un calorimetru cu capacitate calorică neglijabilă, se găsește apă (c1=4200J/kgK) cu temperatura t1=20oC. În apă, se introduce o bucată de metal având masa egală cu cea a apei. Temperatura metalului este t2=32oC. Temperatura de echilibru este t=22oC. Determinați căldura specifică a metalului din calorimetru.
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6.
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Un obiect din argint (c1=250 J/kgK) și unul din plumb (c2=125 J/kgK) au masele m1=m2=200g. Ambele corpuri au inițial temperatura t=50oC și sunt supuse unui proces de răcire. Pe parcursul desfășurării întregului fenomen de răcire, cele două corpuri cedează mediului înconjurător căldurile Q1=1500 J, respectiv Q2=750 J. Se cere să determinați temperatura fiecărui corp la sfârșitul procesului de răcire.
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