I have a test tomorrow and can't figure these problems out. please help. a. Pam has a momentum of 100kg m/s to the right.
If she is traveling at 20m/s to the right, what is her mass?

b. Donna has a momentum of 100kgm/s to the left. If she has a mass of 70kg, what is her velocity?

c. Assuming there are no other forces acting on Donna or Pam, what is the net momentum of the system consisting of Donna and Pam?

d. If Donna and Pam collide, does the net momentum increase, decrease, or stay the same?

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→∞.