Which limitation increased for Viking longships entering shallow rivers?

💡 Explanation

Draft increases with reduced water depth, intensifying the wetted area of the hull; therefore, frictional drag increases because viscous shear acts on area underwater, rather than sail performance being directly affected.

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• Which outcome arises when Viking longship sails experience submersion?
• Which consequence amplified risk after defenders depleted projectile supply from medieval trebuchet defenses?
• Which outcome results when the integrity of a terrace wall in the Andes fails during heavy rains?
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