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(i) A closed cylindrical vessel 0.2 m in diameter and 1.2 m long is filled with water upto a height of 0.8 m form the bottom. Find the speed of the vessel about its vertical axis, when the axial depth of water is zero.        

(ii) How would you define the strength of shock wave? What do you mean by weak shock? Also find the expression for the strength of shock in terms of density ratio.

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