A highly rigid cubical block \Delta of small mass M and side \(\mathcal{L}\) is fixed rigidly onto another cubical block B of the same dimensions and of low modulus of rigidity n such that the lower face of A completely covers the upper face of B . The lower face of B is rigidly held on a horizontal surface. A small force \Gamma is applied perpendicular to one of the side faces of \Delta . After the force is withdrawn block A executes small oscillations. The time period of which is given by
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By substituting the dimensions of mass [M], length [L] and coefficient of rigidity \(\left[ML^{-1}T^{-2}\right]\) we ge \(T = 2 \pi \sqrt{\frac{M}{\eta L}}\) is the right formula for time period of oscillations
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