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# First and second law of thermodynamics

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1. For the following processes, state whether the driving force is the first or second law of thermodynamics. The systems are in italics and we are only interested in whether the properties of the system have changed. Explain your choice in 1-2 sentences.

a. Warming up exercises when muscles are worked the cells "burn" more glucose and the oxidation releases energy which is stored as ATP. However only about 50% is stored and the rest increases the temperature of the muscle tissue.
b. You observe the trees in the forest do not grow in straight lines. Forests that were plants by the CCC camps in the Great Depression have the trees plants in long straight rows. Anyone visiting these knows immediately that this is not a natural forest.
2. 12.0L of monoatomic ideal gas at 15◦C and 4atm are expanded to a final pressure of 1.2atm. Calculate ∆U, q, w, and ∆S if the process is:
a. Reversible and isothermal
i. Prove that for the process in part b ∆S is zero.
d. Explain, in 3-4 sentences, why ∆S is different in all three parts
3. The following equation is an equation of state for an imagined gas: . The term accounts for the attractions between the gas molecules. Determine ?

##### Solution Summary

One part of the problem was to consider some example of thermodynamic processes and conclude is it example of the first or the second law of thermodynamics. Other part of the problem was to calculate internal energy, entropy, work and heat for ideal monatomic gas if we have reversible and irreversible thermodynamics processes.

##### Solution Preview

Hi,

1. For the following processes, state whether the driving force is the first or second law of thermodynamics. The systems are in italics and we are only interested in whether the properties of the system have changed. Explain your choice in 1-2 sentences.

a. Warming up exercises when muscles are worked the cells "burn" more glucose and the oxidation releases energy which is stored as ATP. However only about 50% is stored and the rest increases the temperature of the muscle tissue.

This is an example of the first law of thermodynamics. The first law of thermodynamics is a version of the law of conservation of energy applied on thermodynamics systems. The law of conservation of energy states that the total energy of an isolated system is constant; energy can be transformed from one form to another, but cannot be created or destroyed. In our example we have energy that is stored in the form of ATP and our body can use part of that energy for doing some work and part of energy is ...

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