A 25kg box starts from rest and slides down a 200m frictionless ramp that has an angle of 20degrees from the horizontal. What is the acceleration of the box. 4pts. Draw a Freebody diagram, assign a meaningful coordinate system, identify all forces acting on the free body diagram.
2pts. Apply Newton’s second law to show how you calculate net force and the relationship between mass and acceleration.
2pts. Identify known and unknown variables.
2pts. Solve

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→∞.