Airplane travelers sometimes note that their cosmetics bottlesand other containers have leaked during a flight. What might causethis? (b) When blood pressure is measured, why must the cuff beheld at the level of the heart? (c) Why does buoyancy occur? Isbuoyant force a conservative force? Is potential energy associatedwith it? Explain your answer. (d) Explain how the tube in thefigure below, known as a siphon, can transfer liquid from onecontainer to a lower one even though the liquid must flow uphillfor part of its journey. (Note that the tube must be filled withwater to start with.)
