Wish to drink a milkshake through a standard drink straw of diameter 7mm and length 20cm. The viscosity of the milkshake is 6pa-s and its density is the same as water. In order to enjoy the shake you require a minimum flow rate of 1cm3/s.
A) The entrance of the straw is located at the bottom of the 15cm deep shake. What is the absolute pressure at the entrance of the straw?
B) What is the absolute pressure needed at the top of the straw to maintain that flow rate?