The value of k (the electrical constant in Coulomb's Law) .
Question 13 options:
1) depends on the separation distance between the two charges
2) is impossible to determine
3) is different when used to determine the electric field strength instead of the electric force
4) never changes
5) depends on how many charged particles are present

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

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?