Which consequence occurs when a Qin dynasty crossbow using cast iron triggers rapid crack propagation?

💡 Explanation

A rapid change in deformation causes stress on the cast iron. The mechanism is brittle fracture and the release of stored strain energy, because cast iron has poor tensile strength; therefore, rapid cracks disable the crossbow, rather than bend with the stress like other metals.

• Which outcome results from depleted hydraulic head at Aztec chinampa systems?
• Which risk increased when medieval pavers switched uneven surfaces?
• Which consequence resulted when Inca agricultural terraces exceeded wall stability limits?
• Which functional result arises when Viking longship rigging ropes stretch excessively in sustained winds?
• Which consequence resulted from errors in translating information recorded on quipu used for managing Inca terrace farming?
• Which risk increased for Mayan hydraulic systems following deforestation?