Aman stands on top of a cliff and shouts.
he hears the echo on the third clap when
he claps his hand at the rate of two claps
per second. what is the distance between
man & the obstruction, if the velocity of
sound is 320 m/s
[iom 98]
a. 320
b. 460
c. 640
d. 160

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?