Determine the moment of inertia about an axis perpendicular to the page and passing through the pin at o. the thin plate has a hole in its center. its thickness is 70 mm , and the material has a density ρ= 80 kg/m3 .

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?