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A steel wire is suspended vertically from a rigid support. When loaded with a weight in air, it extends by $l_a$ and when the weight is immersed completely in water, the extension is reduced to $l_w$. Then the relative density of material of the weight is
A cubical block of side $'a'$ and density $'\rho '$ slides over a fixed inclined plane with constant velocity $'v'$ . There is a thin film of viscous fluid of thickness $'t'$ between the plane and the block. Then the coefficient of viscosity of the thin film will be
Three liquids of equal masses are taken in three identical cubical vessels $A, B$ and $C .$ Their densities are $\rho_{A}, \rho_{B}$ and $\rho_{C} \cdot$ The force exerted by the liquid on the base of the cubical vessel is
According to Bernoulli's equation $\frac{P}{{\rho g}} + h + \frac{1}{2}\,\frac{{{v^2}}}{g} = {\rm{constant}}$ The terms $A, B$ and $ C$ are generally called respectively:
According to Bernoulli's equation $\frac{P}{{\rho g}} + h + \frac{1}{2}\,\frac{{{v^2}}}{g} = {\rm{constant}}$ The terms $A, B$ and $ C$ are generally called respectively:
A barometer kept in an elevator reads $76 \,cm$ when the elevator is accelerating upwards. The most likely pressure inside the elevator (in $cm$ of $Hg$ ) is ........
A cylindrical vessel of base radius $R$ and height $H$ has a narrow neck of height $h$ and radius $r$ at one end (see figure). The vessel is filled with water (density $\rho_w$ ) and its neck is filled with immiscible oil (density $\rho_0$ ). Then, the pressure at