When an object cools down, heat is withdrawn from it. Does the entrophy of the object decrease in this process? If yes, is it a violation of the second law of thermodynamics stated in terms of increased in entrophy?

The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy ? Why ?

Assertion : When a glass of hot milk is placed in a room and allowed to cool, its entropy decreases. Reason : Allowing hot object to cool does not violate the second law of thermodynamics.

When we heat an object, it expands. Is work done by the object in this process? Is heat given to the object equal to the increase in its internal energy?

Asssertion: It is not possible for a system, unaided by an external agency to transfer heat from a body at lower temp. to another at a higher temp. Reason: It is not possible to violate the second law of thermodynamics.

The figure shows the speed as a function of time for an object in free fall near the surface of the earth. The object was dropped from rest in a long evacuated cylinder . If the same object were released in air, the magnitude of its acceleration would begin at the free-fall value, but it would decrease continuously is zero as the object continued to fall. For which one of the choices given does the solid line best represent the speed of the object as a function of time when it is dropped from rest in air ? Note: The dashed line shows the free-fall under vacuum graph for comparison.

When does the flow of heat from a hot object to a cold object stop ?

Consider the statement (A) and (B) and identify the carrect answers. A . First law of thermodynamics specifics the consitions under which a body can use its heat energy to produce the work. B. Second law of thermodynamics states that heat always flows from haot body to cold body the itself .