Acart attached to a spring with constant 3.24 n/m vibrates with position given by x = (5.00 cm) cos(3.60t rad/s).
(a) during the first cycle, for 0 < t < 1.75 s, at what when is the system’s potential energy changing most rapidly into kinetic energy?
(b) what is the maximum rate of energy transformation?

Intro: a solid ball of radius rb has a uniform charge density ρ. part a: what is the magnitude of the electric field e(r) at a distance r> rb from the center of the ball? express your answer in terms of ρ, rb, r, and ϵ0. part b: what is the magnitude of the electric field e(r) at a distance r express your answer in terms of ρ, rb, r, and ϵ0. part c: let e(r) represent the electric field due to the charged ball throughout all of space. which of the following statements about the electric field are true? check all that apply. e(0) = 0 e(rb)=0 limr→∞e(r)=0 the maximum electric field occurs when r=0 the maximum electric field occurs when r=rb the maximum electric field occurs as r→∞.