A man is attempting to push a chair across the floor exerting a force of 50 N .When will the chair exert a force of 50 N on the man?

ALWAYS ( in all cases and at all times)

Explanation:

From Newton's 3rd Law of motion which states that every action that occurs (force) there will be equal as well as opposite reaction. Therefore as the man is pushing the chair exerting 50N force, the chair also is is exerting equal force as well as opposite force on him as he is pushing it

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

no

sodium is solid at rt