What is the speed of a car that travels 150km in 3.00 hrs?

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

What can you increase the strength of an electromagnet by

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?