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Get Full Access to University Physics - 13 Edition - Chapter 23 - Problem 21dq
Get Full Access to University Physics - 13 Edition - Chapter 23 - Problem 21dq

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# In electronics it is customary to define the potential of

ISBN: 9780321675460 31

## Solution for problem 21DQ Chapter 23

University Physics | 13th Edition

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Problem 21DQ

In electronics it is customary to define the potential of ground (thinking of the earth as a large conductor) as zero. Is this consistent with the fact that the earth has a net electric charge that is not zero? (Refer to Exercise 21.28.) 21.28 Electric Field of the Earth. The earth has a net electric charge that causes a field at points near its surface equal to 150 N/C and directed in toward the center of the earth. (a) What magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) What would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? Is use of the earth’s electric field a feasible means of flight? Why or why not?

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30​ ​August​ ​2017 Earth​ ​Sun​ ​Relationship​ ​(Cont’d) ● Tilt​ ​of​ ​ arth​ ​=​ ​23.5° ● Earth’s​ ​revolution​ ​around​ ​the​ ​ ​ ​associated​ ​weather ○ Aphelion​ ​-​ ​Earth​ ​is​ ​farthest​ ​from​ ​the​ ​Sun;​ ​gives​ ​N​ ​Hemisphere​ ​warm​ ​weather​ ​and S​ ​Hem​​ old​ ​temperatures​ Occurs​ ​roughly​ uly​ ) ○ Perihelion​ ​-​ ​Earth​ ​is​ ​closest​ ​to​ ​the​ ​Sun;​ ​gives​ ​N​ ​Hem​ ​cold​ ​weather​ ​and​ ​S​ ​Hem warm​ w​ eather​​ occurs​ ​roughly​ ​January​ ​3) ○ The​ ​Summer​ ​Solstice​ ​-​ ​June​ ​21,​ ​N​ ​Hem​ ​is​ ​tilted​ ​towards​ ​the​ ​Sun,​ ​getting​ ​the most​ ​radiation​ ​out​ ​of​ ​the​ ​year;​ ​Subsolar​ ​point​ ​is​ ​23.5°​ ​N;​ ​North​ ​Pole​ ​gets​ ​24​ ​hrs of​​ aylight ○ Autumnal​ ​Equinox​ ​-​ ​Sept​ ​22,​ ​neither​ ​hemisphere​ ​is​ ​more​ ​so​ ​tilted​ ​towards​ ​the Sun;​ ​Sub-solar​ ​point​ ​is​ ​at​ ​equator ○ Winter​ ​Solstice​ ​-​ ​Dec​ ​21,​ ​S​ ​Hem​ ​is​ ​tilted​ ​towards​ ​the​ ​Sun,​ ​now​ ​beginning​ ​their “summer”;​ ​Subsolar​ ​point​ ​is​ ​23.5°​ ​S;​ ​South​ ​Pole​ ​gets​ ​24hrs​ ​of​ ​daylight ○ Vernal​ ​Equinox​ ​-​ ​March​ ​20,​ ​neither​ ​hemisphere​ ​is​ ​tilted​ ​towards​ ​the​ ​Sun; Sub-solar​ ​point​ ​​ ​ quator ● Changing​ ​seasons​ ​are​​ ue​​ o ○ the​ ​tilt​ ​of​ ​the​ ​earth’s​ ​axis ○ its​ ​pat​ round​ ​the​ ​Sun ○ the​ ​rotation​ ​of​ ​the​ ​Earth​ ​ab

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In electronics it is customary to define the potential of