. Based on the fact that in an EM wave propagating through a vacuum or air, the electric and magnetic field carry equal amounts of energy per unit volume of space, derive two additional equations for the total energy density.

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system