Wind blowing across suspended power lines may
cause the power lines to vibrate at their...
Physics, 25.03.2020 18:50 gracethegreat1
Wind blowing across suspended power lines may
cause the power lines to vibrate at their natural
frequency. This often produces audible sound
waves. This phenomenon, often called an
Aeolian harp, is an example of
(1) diffraction (3) refraction
(2) the Doppler effect (4) resonance
Answers: 1
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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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