If a new material is found that is a superconductor at all temperatures, what parts of some common electric devices would definitely not be made out of it

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Explain what happens at the saturation point when adding salt to water at room temperature.

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot