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Which outcome occurred when Viking longships experienced significant swells?

A)Increased shear stress between planks
B)Reduced mast swaying amplitudes slowly
C)Decreased average hull frictional drag
D)Enhanced wave-driven propulsion efficiency

💡 Explanation

Increased shear stress between planks resulted because the hogging and sagging motion induced longitudinal bending; therefore, the rope lashing connecting overlapping planks experienced concentrated forces, causing potential decoupling rather than evenly distributing loads.

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