chapter 15 - Problem 15.7 Bioluminescence Some species of...

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Problem 15.7 Bioluminescence Some species of dinoflagellate (a type of unicellular plankton) can produce light as the result of biochemical reactions within the cell. This light is an example of bioluminescence. It is found that bioluminescence in dinoflagellates can be triggered by deformation of the cell surface with a pressure as low as one dyne per square centimeter. Part A What is this pressure in pascals? Express your answer using two significant figures. ANSWER: = 0.10 Correct Part B What is this pressure in atmospheres? Express your answer using two significant figures. ANSWER: Problem 15.27 IP The patient in the figure is to receive an intravenous injection of medication. In order to work properly, the pressure of fluid containing the medication must be 109 at the injection point. Part A If the fluid has a density of 1030 , find the height at which the bag of fluid must be suspended
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Problem 15.27 Part A above the patient. Assume that the pressure inside the bag is one atmosphere. ANSWER: = 0.760 Correct Part B If a less dense fluid is used instead, must the height of suspension be increased or decreased? ANSWER: must be increased must be decreased Correct Part C Explain. ANSWER: My Answer: Fluid Pressure in a U-Tube A U-tube is filled with water, and the two arms are capped. The tube is cylindrical, and the right arm has twice the radius of the left arm. The caps have negligible mass, are watertight, and can freely slide up and down the tube.
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Fluid Pressure in a U-Tube Part A A one-inch depth of sand is poured onto the cap on each arm. After the caps have moved (if necessary) to reestablish equilibrium, is the right cap higher, lower, or the same height as the left cap? Hint A.1 Pressure at the surface Hint not displayed Hint A.2 Evaluate the weight of the sand Hint not displayed Hint A.3 Evaluate the pressure applied by the sand Hint not displayed ANSWER: higher lower the same height Correct Although one inch of sand on the right cap is much heavier than one inch of sand on the left cap, the pressures exerted by the sand are the same on both caps. Since the pressures exerted by the sand are equal, the pressures at the base of each arm due to the water must be equal. This requires equal heights of water in the two arms. Part B The sand is removed and a 1.0- -mass block is placed on each cap.
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Fluid Pressure in a U-Tube Part A After the caps have moved (if necessary) to reestablish equilibrium, is the right cap higher, lower, or the same height as the left cap?
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