## Question

Air is blow through a pipe *AB* at a rate of 15 liter per minute. The cross section area of the wide portion of the pipe *AB* is 2 cm^{2} and that of the narrow potion is 0.5 cm? the difference in the water level *h* is :

### Solution

1.55 mm

.

= 1.55 mm.

#### SIMILAR QUESTIONS

Water is flowing through two horizontal pipes of different diameters which are connected together. In the first pipe the speed of water is 4.0 m/s and the pressure is . Calculate the speed and pressure of water in the second pipe. The diameters of the pipes are 3.0 cm and 6.0 cm respectively.

A liquid is kept in a cylindrical vessel which is being rotated about its axis. The liquid rises at the sides. If the radius of the vessel is 0.05 m and the speed of rotation is 2 rev/s, find the difference in the heights of liquid at the centre of the vessel and at its sides.

The pressure difference between two points along a horizontal pipe, through which water is flowing, is 1.4 cm of mercury. If, due to non-uniform cross-section, the speed of flow of water at the point of greater cross-section is 60 cm/s, calculate the speed at the other point. Density of mercury .

Water flows into a horizontal pipe whose one end is closed with a valve and the reading of a pressure gauge attached to the pipe is . This reading of the pressure gauge falls to when the valve is opened. Calculate the speed of water flowing into the pipe.

Air is streaming past a horizontal aeroplane wing such that its speed is 120 ms^{–1} at the upper surface and 90 ms^{–1} at the lower surface. If the density of air is 1.3 kg/m^{3}, find the difference in pressures between the two surfaces of the wing. If the wing is 10 *m* long and has an average width of 2 m, then calculate the gross lift on it.

A horizontal tube has different cross-sectional areas at points *A* and *B*. The diameter of *A* is 4 cm and that of *B* is 2 cm. Two manometer limbs are attached at *A* and *B*. When a liquid of density 0.8 g/cm^{3} flows through the tube, the pressure-difference between the limbs of the manometer is 8 cm. calculate the rate of flow of the liquid in the tube. (*g* = 980 cm/s^{2})

Find out the velocity of efflux of water from a hole in the wall of a tank made at 20 m below the free surface of water in the tank.

*g* = 10 m/s^{2}.

Water tank has a hole in its wall at a distance of 10 m below the free surface of water. The diameter of the hole is 2 mm. Compute the velocity of efflux of water from the hole and the rate of flow of water. (*g* = 9.8 m/s^{2})

*S*_{1} and *S*_{2} are spring balances. A block *A* is hanging from spring balance*S*_{1} and immersed in a liquid *L* which is contented a beaker *B*. The mass of beaker *B* is 1 kg and the mass of liquid *L* is 1.5 kg. The *S*_{1} and *S*_{2}balances reads 2.5 kg and 7.5 kg respectively. What will be the reading of*S*_{1} and *S*_{2} when the block *A* is pulled up out of the liquid :

Water from a tap emerge vertically downward with a initial speed of 1 m/s. The cross section area of the tap is 10^{–4} m^{2}. Assume that the pressure is constant throughout the stream of water and that the flow steady. The cross section area of the stream 0.15 m below the tap is :