Chapter 10: Q6Q (page 260)
A submerged can of Coke sink, but a can of Diet Coke will float. (Try it!) Explain.
The density of Coke is greater than the density of the Diet Coke.
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A drinking fountain shoots water about 12 cm up in the air from a nozzle of diameter 0.60 cm (Fig. 10–57). The pump at the base of the unit (1.1 m below the nozzle) pushes water into a 1.2-cm-diameter supply pipe that goes up to the nozzle. What gauge pressure does the pump have to provide? Ignore the viscosity; your answer will therefore be an underestimate.
(I) Estimate the pressure exerted on a floor by (a) a one-pointed heel of area = 0.45 cm2, and (b) one wide heel of area 16 cm2, Fig. 10–48. The person wearing the shoes has a mass of 56 kg.
(III) A patient is to be given a blood transfusion. The blood is to flow through a tube from a raised bottle to a needle inserted in the vein (Fig. 10–55). The inside diameter of the 25-mm-long needle is 0.80 mm, and the required flow rate is \(2.0\;{\rm{c}}{{\rm{m}}^3}\) of blood per minute. How high h should the bottle be placed above the needle? Obtain \(\rho \) and \(\eta \) from the Tables. Assume the blood pressure is 78 torr above atmospheric pressure.
Figure 10-55
A small amount of water is boiled in a 1-gallon metal can. The can is removed from the heat and the lid is put on. As the can cool, it collapses and looks crushed. Explain.
Why do you float higher in salt water than in freshwater?
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