5. What is the pressure difference between the 2 ends of artery if the blood flow rate is 1.2 x 10^-7m³/s? (=4103Pa.s) and an artery has a diameter of 2.75mm and length of 30cm.

6. A 75 kg woman fully submerged in water. a) What is the buoyant force on her in air? b) What is the buoyant force on her in sea water?

Air density is 1.29 kg/m³ , Fresh water density is 1000kg/m³ and Sea water density is 1025kg/m³

7. There is a horizontal pipe which its radius tapers down from 20 cm to 15 cm. At 20 cm the pressure is 2.75 atm and its velocity is 3 m/s. What is the velocity and pressure at 15 cm area?

Density of water is 1000kg/m³.

8. A gold ball has a radius 10 cm. What is the weight of a gold ball? what should be radius of a Aluminum with the same mass? ( Density of gold is 19,300kg/m³and Aluminum density is 2,700 kg/m³)