You are trying to solve a problem in which you are given the net force on a cow, the time it is applied, the distance it is moved, and the initial velocity, and you are asked to find the mass of the cow. You think you have solved the problem, but when you check with some study-buddies you find that each one has come up with a different solution! Which solutions can you reject based on a units check?

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→∞.