A razor-blade floats on the surface of water | vedclass

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Question

(A) When a razor-blade floats on water,it is supported by the buoyant force (Archimedes' principle) and the upward force due to surface tension. Since

Vedclass · Accepted Answer

Volume of displaced water is lesser than blade's own volume.

Vedclass · Answer

(A) When a razor-blade floats on water,it is supported by the buoyant force (Archimedes' principle) and the upward force due to surface tension. Since the density of the blade is greater than that of water,it would normally sink. However,surface tension creates a 'dimple' in the water surface,effectively increasing the volume of water displaced beyond the actual volume of the blade. When the glass is shaken,the surface tension effect is broken,and the blade sinks. Statement $A$ is incorrect because,while floating,the effective volume of displaced water (including the surface tension effect) is equal to the volume required to balance the weight of the blade. Statement $B$ is correct because the blade displaces less water when submerged than when it was floating supported by surface tension. Statement $C$ is correct as it describes the mechanism of support. Statement $D$ is correct as it explains the equilibrium condition for the floating blade.

$A$ razor-blade floats on the surface of water contained in a glass. When the glass is gently shaken,the razor-blade sinks. Mark the incorrect statement.

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