a 12V battery is used to recharge an electric lawnmower. Calculate the charge flowing through the lawnmower when 216J are transferred.

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

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?

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?