Q11.3: NCERT Physics - Part 2 THERMODYNAMICS 11.3 Solution: Explain why (a) Two bodies at different temperatures and if…

**Answer:** (a) Heat capacity matters. (b) High specific heat absorbs more heat. (c) Temperature rises. (d) Water moderates temperature. **Step-by-Step Explanation:** (a) The final temperature depends on the heat capacities of the two bodies, not just their initial temperatures. If heat capacities differ, the mean temperature is not reached. Only if $m_1c_1 = m_2c_2$ will the final temperature be $(T_1 + T_2)/2$. (b) A coolant with high specific heat can absorb a large amount of heat with a relatively small rise in temperature, making it efficient for preventing overheating. (c) During driving, the tyre temperature increases due to friction. Since volume is constant, pressure increases with temperature ($P \propto T$ at constant V). (d) A harbour town has water bodies nearby. Water has high specific heat, so it heats and cools slowly, moderating the climate. A desert town lacks this moderation .