In which situation is work being done?
no force is applied.
the force does not result in displacement.
the force and displacement are perpendicular to each other.
the force and displacement are in the same direction.

By definition, we have that work is defined as the product point between two vectors.

We have then:

Where,

F: force in the direction of displacement

d: distance traveled

Rewriting the equation we have:

If the force and the displacement go in the same direction, then the cosine of the angle is different from zero and therefore there is work done.

The force and displacement are in the same direction.

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​