Spiders ballooning in electric fields. Some spiders disperse by a process known as ballooning. When they...
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Spiders ballooning in electric fields. Some spiders disperse by a process known as ballooning. When they extrude silk threads (see the figure below), the threads catch on a breeze that can carry a spider far away and up to several kilometers high. However, some spiders can balloon even on a calm day, as was recorded by Charles Darwin during his journey on the Beagle. When extruded, the nonconducting silk thread is negatively charged and thus can experience an electric force in the naturally occurring electric field in the atmosphere, especially near the sharp points on leaves, needles, and branch tips. Near those sharp points, the magnitude E of the field can be 10 N/C. (a) What is the minimum charge magnitude q needed on the silk if a 0.95 mg spider is to be lifted by the electric force due to a vertical field with that field magnitude, and (b) what is the corresponding minimum number n of electrons? (a) Number i -9.31E-4 Units C (b) Number 5.81E15 Units Nature Picture Library/Alamy Stock Photo Spiders ballooning in electric fields. Some spiders disperse by a process known as ballooning. When they extrude silk threads (see the figure below), the threads catch on a breeze that can carry a spider far away and up to several kilometers high. However, some spiders can balloon even on a calm day, as was recorded by Charles Darwin during his journey on the Beagle. When extruded, the nonconducting silk thread is negatively charged and thus can experience an electric force in the naturally occurring electric field in the atmosphere, especially near the sharp points on leaves, needles, and branch tips. Near those sharp points, the magnitude E of the field can be 10 N/C. (a) What is the minimum charge magnitude q needed on the silk if a 0.95 mg spider is to be lifted by the electric force due to a vertical field with that field magnitude, and (b) what is the corresponding minimum number n of electrons? (a) Number i -9.31E-4 Units C (b) Number 5.81E15 Units Nature Picture Library/Alamy Stock Photo
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Principles Of Information Security
ISBN: 9780357506431
7th Edition
Authors: Michael E. Whitman, Herbert J. Mattord
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