The fact that a refrigerator requires energy to move heat from a colder object (the inside of the refrigerator) to a hotter object (the outside of the refrigerator) is a real life observation of which law of thermodynamics?

Clausius statement of the Second Law of Thermodynamics.

Explanation:

The fact that refrigerator requires energy to move the heat from a colder reservoir to a hotter reservoir is a real life observation of the Clausius statement of the Second Law of Thermodynamics.

Clausius statement tells that it is impossible to construct a device operating in a cycle that transfer heat from a low temperature reservoir to a higher temperature reservoir without consuming any work.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

elctricity and magnet is conversion to it