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A block of aluminum is heated electrically by a 30 w heater if the temperature rises by ...

A block of aluminum is heated electrically by a 30 w heater if the temperature rises by 10°c in 5 minutes, the heat capacity of the aluminum is
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  • A 900 JK-1
  • B 90 JK-1
  • C 100 JK-1
  • D 200 JK-1
Correct Answer: Option A
Explanation:
Heat supplied = Heat gained Pt = MCDθ
30 x 5 x 60 = c x 10
where c = mc which is the heat capacity
c = (30 x 5 x60)/10 = 900 JKg-1

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