Select the correct arrows. Identify the arrows that show the correct direction of heat transfer.

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.

Iwill give brainliest if you answer right : )

In the first law of thermodynamics, triangle e=q-w, what does q stand for