Problem 1: Hydrostatic Weighing A person's percentage of body fat can be estimated by weighing the person both in air and underwater, from which the average density ,qam can be calculated. A widely used equation that relates average body density to fat percentage is the Siri equation: 495 % body f at = pavg 450 where Pam is measured in g/cm3. lOne person's weight in air is 690 N while her weight underwater is 42 N. What is her percentage of body fat? Problem 2: Plaque in Artery Blood in a carotid artery carrying blood to the head is moving at 0.15 m/s when it reaches a section where plaque has narrowed the artery to 80% of its diameter. What pressure drop occurs when the blood reaches this narrow section? Use 1.05 g/cm3 for the density of the blood