What is the equivalent resistance (total resistance) of the series circuit shown?

Abearing is designed to a reduce friction b. support a load c.guide moving parts such as wheels, shafts and pivots d. all of the above

What are similarities and differences of reflection, refraction, diffraction and absorption?

Light traveling in a medium with a refractive index 1.19 is incident on a plate of another medium with index of refraction 1.79. at what angle of incidence is the reflected light fully polarized?