Biological Physics: Energy, Information, Life - download pdf or read online

By Philip Nelson

ISBN-10: 0716743728

ISBN-13: 9780716743729

Physics and engineering departments are development examine courses in organic physics, yet before there has no longer been a synthesis of this dynamic box on the undergraduate point. organic Physics specializes in new ends up in molecular cars, self-assembly, and single-molecule manipulation that experience revolutionized the sector in recent times, and integrates those subject matters with classical effects. The textual content additionally presents foundational fabric for the rising box of nanotechnology. The textual content is equipped round a self-contained middle aimed at undergraduate scholars who've had 12 months of calculus-based physics. extra "Track-2" sections include extra complicated fabric for senior physics majors and graduate scholars.

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Draw a picture to help you visualize this situation. Thus to create more surface area requires that we break some bonds. The energy needed to do that, divided by the new area created, is Σ. a. 072 J/m2 . Estimate N . b. Assuming the molecules are closely packed, estimate the approximate molecule diameter. c. What estimate for Avogadro’s number do you get? 7 Tour de France A bicycle rider in the Tour de France eats a lot. If his total daily food intake were burned it would liberate about 8000 kcal of heat.

Could the missing energy be accounted for by the altitude change in a hard day’s racing? Regardless of how you answered (a), next suppose that on one particular day of racing there’s no net altitude change, so that we must look elsewhere to see where the missing energy went. We have so far neglected another part of the energy equation: the rider gives off heat. Some of this is radiated. Some goes to warm up the air he breathes in. But by far the greatest share goes somewhere else. The rider drinks a lot of water.

Then the complete vaporization of 1 cm3 of liquid requires that we break all the bonds. The corresponding energy cost is Qvap × (1 cm3 ). Next consider a molecule on the surface of the fluid. It has only five bonds—the nearest neighbor on the top is missing (suppose this is a fluid–vacuum interface). Draw a picture to help you visualize this situation. Thus to create more surface area requires that we break some bonds. The energy needed to do that, divided by the new area created, is Σ. a. 072 J/m2 .

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Biological Physics: Energy, Information, Life by Philip Nelson


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