Solve the all parts of given question:
Question: A 20-cm-radius ball is uniformly charged to 76nC.
Part I: What is the ball's uniform charge density (C/m3)?
Part II: How much charge is enclosed by spheres of radii 5, 10, and 20 cm?
Part III: What is the electric field strength at points 5, 10, and 20 cm from the center?
I need help to solve the above question and express your answers using two significant figures. Enter your answers numerically separated by commas.