Space is essentially a vacuum where there is no matter whatsoever. Would you expect any type of wave (transverse, longitudinal, or surface) to travel through space? Why or why not?

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

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?

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight