Adisk of radius r produces a potential v = 64.4 mv at the center of the disk at point p, as shown. assume that charge density varies linearly with the radius according to ïƒ = ar, where a = 7.55 ã— 10-10 c/m3. calculate the radius of the disk in centimeters.

Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?

Agust of wind pushes a beach ball with a force of 9 newtons.the ball rolls 10 meters in 3 seconds. what is the power of the wind?