Answer question 10,12,14,18.

*10. What is the pressure exerted by a column of fresh water 10 m high? How high must the column be for the pressure exerted by it at the bottom to be 10' N/m?? The density of fresh water - 103 kg/m3 11. What is the pressure exerted by a column of sea water 2 m high? What would be the height of the column of fresh water which exerted the same pressure? The densities of fresh water and sea water = 1000 and 1030 kg/m' respectively. *12. At what depth below the surface is the pressure due to sea water equal to 107 N/m?? What was the maximum pressure exerted on the bathyscaphe in the Marianas Trench (10900m deep) assuming that the sea water was of uniform density 1025 kg/m3, whatever the depth?18. A water barrel can withstand a pressure of 2 X 105 N/m2. The lid of the barrel has a vertical tube passing through it and the cross-sectional area of this tube is 0'3 cm2. Water is slowly poured into the tube. If the tube is 21 m long will the barrel burst before the tube is full of water?14. An unknown liquid is poured into a vertical tube and exerts a pressure of 3.5 x 103 N/m at the bottom of the tube when the total depth of liquid is 45:0 cm. What is the density of the liquid? To what depth would the tube have to be filled with glycerine of density 1:26 g/cm in order that the same pressure be exerted