How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?

Assessment: WAEC SSCE - Physics - 1990 (Objective) Subject: Physics

Question 1 Report

How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg^-1k^-1 cools from 85^oC to 25^oC?

1.38 x 10⁶ J

2.53x10⁴J

7.66x10³J

1.38x10³J

1.27 X10³J

Answer Details

The amount of heat given out by the iron can be calculated using the formula: Q = mcΔT Where Q is the heat energy transferred, m is the mass of the iron, c is the specific heat capacity of iron, and ΔT is the change in temperature of the iron. Substituting the given values, we have: Q = (0.05 kg) × (460 J/kg·K) × (85°C - 25°C) Q = 0.05 kg × 460 J/kg·K × 60°C Q = 1380 J Therefore, the amount of heat given out by the iron when it cools from 85°C to 25°C is 1380 J. Hence the correct option is (d) 1.38x10³J.

Read lesson note on Heat Energy (WAEC)

Heat Energy

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How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?

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