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Calculate the work, heat transfer, and internal energy change in a simple process. We discussed the concepts of work and energy earlier in mechanics. Examples and related issues of heat transfer between different objects have also been discussed in the preceding chapters.
Internal Energy, Work and Heat. 1. The internal energy of a system increased by 982 J when it absorbed 492 J of heat. Was work done by or on the system? How much work was done? What is ΔV if pressure is constant at 1 atm? 2. A gas in a cylinder was placed in a heater and gained 5500 kJ of heat.
Internal energy changes can be used to do work or transfer heat. The amount of work and heat must equal the change in internal energy.
Thermodynamics Unit Internal Energy, Work and Heat 1. The internal energy of a system increased by 982 J when it absorbed 492 J of heat. Was work done by or on the system? How much work was done? What is ΔV if pressure is constant at 1 atm? €
In order to understand the relationship between heat, work, and internal energy, we use the first law of thermodynamics. The first law of thermodynamics applies the conservation of energy principle to systems where heat and work are the methods of transferring energy into and out of the systems.
The heat capacity will depend on whether energy goes into work, instead of only increasing U. Therefore, we distinguish between: •Heat capacity at constant volume (C V), for which W = 0. •Heat capacity at constant pressure (C p), for which W > 0 (most systems expand when heated). Q C (for small T) T ≡ ∆ ∆
Describe the work done by a system, heat transfer between objects, and internal energy change of a system; Calculate the work, heat transfer, and internal energy change in a simple process
