Which physical law underlies the first law of thermodynamics? conservation of ma

Question

Which physical law underlies the first law of thermodynamics? conservation of matter increase in entropy conservation of energy conservation of Work What happens to the entropy of a bucket of water as it is cooled down (but not frozen)? It increases It decreases It stays the same. What happens to the entropy of a cube of ice as it is melted? It increases It decreases. It stays the same. Which of the heat engine designs above violates the first law of thermodynamics? A B C A and B A and C Which of the heat engine designs above violates the second law of thermodynamics? A B A and B A and C

Explanation / Answer

According to the given problem,

1.) Ans: C,

Ist law, states that energy is neither created not destryed which is conservation of energy principal.

2.) Ans: B,

Entropy is defined as degree of randomness, means more the particle more the entropy. As freezing particles condence to form solid thus reducing the degree of randomness.

3.) Ans A

reason as 2nd problem,

4.) Ans A,

As the energy is not balanced in the engine. 1000 = 250J +650J+100J where the 100J ???.

5.) Ans E,

It is impossible to extract an amount of heat QH from a hot reservoir and use it all to do work W and ans 4th.

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