Mechanical Prop...

A ball of mass $$m$$ and radius $$r$$ is gently released in a viscous liquid. The mass of the liquid displaced by it is $$'m$$ such that $$m > m'$$. The terminal velocity is proportional to :

A jet of water having velocity $$=10\ m/s$$ and stream cross-section $$=2\ cm^2$$ hits a flat plate perpendicularly, with the water splashing out parallel to plate. The plate experiences a force of :

The atmospheric pressure at earth surface is$$ P_{1}$$ and inside mine is $$ P_{2}.$$ They are related as:

From the adjacent figure, the correct observation is

                                                                                            [ KCET 2005 ]

A ball whose density is 0.4 × 103 kg/m falls into water from a height of 9 cm . To what depth does the ball sink

Radius of an air bubble at the bottom of the lake is $$r$$ and it becomes $$2r$$ when the air bubbles rises to the top surface of the lake. If $$P$$ cm of water be the atmospheric pressure, then the depth of the lake is

A triangular lamina of area $$ A $$and height $$ h $$ is immersed in a liquid of density $$\rho$$ in a vertical plane with its base on the surface of the liquid. The thrust on the lamina is

A hydraulic lift is designed to lift heavy objects of maximum mass $$2000 kg$$. The area of cross-section of piston carrying the load is $$2.25 \times 10^{-2} m^2$$. What is the maximum pressure the smaller piston would have to bear?

A water supply maintains a constant rate of flow for water in a hose. You want to change the opening of the nozzle so that water leaving the nozzle will reach a height that is four times the current maximum height the water reaches with the nozzle vertical. To do so, should you

Figure shows aerial views from directly above two dams. Both dams are equally wide (the vertical dimension in the diagram) and equally high (into the page in the diagram). The dam on the left holds back a very large lake, and the dam on the right holds back a narrow river. Which dam has to be built more strongly?