Question 5 a. Explain why liquids in a container have ameniscus. Include a discussion of all relevant forces in youranswer and give examples of different forms of meniscus. [4 marks]b. i. 50 cm3 of water flows through a pipe of radius 1 cm everysecond. If the pressure gradient is maintained what diameter pipeis required to double the flow rate? [1 mark] ii. What is theaverage flow speed in each case in b(i) above? [2 marks] iii. Whatis the pressure gradient in the pipe? Assume water has a viscosityof 1.0x10-3 Pa s) [2 marks] iv. The original pipe branches into 5smaller pipes of 3 mm diameter. What is the flow speed through oneof the smaller pipes? [2 marks] c. A bubble of air is observed tohave a diameter of 2 cm when at a depth of 1.5 m in a swimmingpool. What is the total pressure of air inside the bubble? Thesurface tension of water is 0.073 N m-1 and the density of water is1000 kg m-3 . [2 marks] d. Explain the differences between theterms Elastic Limit, Compressive Limit, Tensile Strength andCompressive Strength. [3 marks] e. Explain the process ofcavitation and give an example of its occurrence. [4 marks]
