Thermal Expansion: Practice Problem & Solution

Solution Explained:

To solve this problem, we apply the core principles of Thermal Expansion. Understanding the underlying formula is key to arriving at the correct answer below:

Thick glass is a poor thermal conductor. When hot water is poured, the inner surface expands rapidly due to heating, while the outer surface remains cold and resists expansion.

This differential thermal expansion creates significant stress, causing the glass to crack. Both A and R are true, and R is the correct explanation for A.