Why is a small space left at the joint between two railway tracks?
A small space is left at the joint between two railway tracks because the metal expands when heated and contracts when cooled. This prevents the tracks from buckling in the heat or creating gaps in the cold, ensuring safe and smooth train operation.
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The correct answer is [B]. A small space is left at the joint between two railway tracks to accommodate the expansion and contraction of the metal due to temperature changes. This phenomenon is known as thermal expansion. Metals, including steel used in railway tracks, expand when heated and contract when cooled. If no space is provided, the tracks would buckle and deform during hot weather as the metal expands. Conversely, in cold weather, the lack of space could cause the tracks to contract and create gaps that might lead to derailments. Therefore, these gaps are crucial for maintaining the structural integrity and safety of the railway system. This precautionary measure is essential for the reliable and safe operation of trains, preventing potential accidents and ensuring smooth travel. The correct answer is [B] Because the metal expands when heated and contracts when cooled.