A piece of iron of mass 100 g and specific heat capacity 460 J kg⁻¹ K⁻¹ cools from 70^ C to 20^ C. The heat released by the iron is

Here are the explanations and solutions for the problems:

1. A piece of iron of mass $100 \, \text{g}$ and specific heat capacity $460 \, \text{J kg}^{-1} \text{K}^{-1}$ cools from $70^\circ \text{C}$ to $20^\circ \text{C}$. The heat released by the iron is

Step 1: Identify the given values and the formula for heat transfer.
Given:
Mass, $m = 100 \, \text{g} = 0.1 \, \text{kg}$
Specific heat capacity, $c = 460 \, \text{J kg}^{-1} \text{K}^{-1}$
Initial