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Determine the quantity of heat in joules given out when a piece of iron of mass ...


Question

Determine the quantity of heat in joules given out when a piece of iron of mass 40g and specific heat capacity 460Jkg °C cools from 70°C to 40°C.

Options

A) 552J

B) 7363

C) 1288J

D) 368J

The correct answer is A.

Explanation:

\(Q = mc(\Delta t)\)
\(Q = 40 \times 460 (70-40)\)
\(= 40 \times 460 \times 30\)
\(= 552000J = 552kJ\)

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