When two systems in contact are not at the same temperature, _____ occurs.expansionheat flowfrictionevaporation

1 answer:

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Heat flow occurs when two systems in contact are not at the same temperature.

What is heat flow?

when two bodies of different temperatures are in contact, heat flow takes place.
Heat flows till the two bodies in contact achieve equilibrium.
To achieve equilibrium, heat flows from hotter bodies to colder bodies.
There is no heat flow after achieving the state of equilibrium because the amount of heat flow from one body to the other is the same.

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By definition we have to:

Applied force: It is the external force that acts directly on a body.

Therefore, we can say that if you have an object and push it towards yourself, you are exerting an external force on the object.

This external force was not acting on the object previously, therefore, it is a force that you are applying at that moment.

Answer:

you exert an Applied Force on an object when you pull it towards you

A. Applied Force