4. A straw of diameter 20 mm and 26 cm long stands vertically in a cup of Mazoe (density approximately equal to water) 10 cm in diameter. 8.5 cm of the straw extends above the Mazoe. A MU first year student in lecture group B, sucks on the straw and the level of the Mazoe begins to drop a rate of 0.75 cm/s. a. Find the speed of the Mazoe inside the straw. b. Calculate the pressure difference in the student’s mouth to the atmospheric pressure,