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The Kinetic energy in order to move the push sled is converted to heat energy of his body and the friction against the push sled 

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Energy is not created or destroyed

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Cooling down in an ice bath after working out.

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Heat will never be seen to flow spontaneously from a colder object to a hotter objects.

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maintenance phase (staying same weight )

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the entropy of a system approaches a constant value as the temperature approaches absolute zero

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spontaneous is a rest break wheres non-spontaneous is working out 

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differentiate Spontaneous and Non-spontaneous reactions 

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differentiate Spontaneous and Non-spontaneous reactions 

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A spontaneous reaction happens with no heat or energy  used whereas non spontaneous has to have heat or  energy

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Explain the relationship between Enthalpy, Free Energy and Entropy

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Explain the relationship between Enthalpy, Free Energy and Entropy

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Gibbs free energy combines enthalpy and entropy into a single value.

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measure of how disbursed the energy of the system is amongst the ways that system can contain energy

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The warmer heating up their bodied after working out. 

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The measurement of  total heat content of a system. The sum of the system's internal energy and the product of its pressure and volume.

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tells us wether a process will be spontaneous or not. (if it will  happen on its own )
delta G= Delta H- T Delta S
If delt G is negative  the process is spontaneous

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Irreversible cannot go back to original

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Reversible can go back to original

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Work is the quantity of energy transferred from one system to another. Force applied.

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These are different physical activities but they all are cardio. 

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State functions only depend on temperature, pressure, and quantity of substance present and not on how they were reached.

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The back muscles is the system and the rest of the body is the surrounding. 

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A particular item is the system, everything that is not included is the surrounding.