Tony (of mass 45 kg) coasts on his bicycle (of mass 20 kg) at a constant speed of 7 m/s, carrying a 7 kg pack. tony throws his pack forward, in the direction of his motion, at 5 m/s relative to the speed of bicycle just before the throw. what is the initial momentum of the system (tony, the bicycle, and the pack)? answer in units of kg · m/s.

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→∞.