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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.

A) 552J

B) 7363

C) 1288J

D) 368J

### Explanation:

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

## Dicussion (1)

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