# Thermodynamics Answer Key

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HW4 Thermodynamics Answer Key |

Procedure
Answer the following questions as your teacher discusses the Introduction to Thermodynamics presentation.

List three examples of a thermodynamic system. a. Nuclear power b. Electronic heat sink c. Rocket launch
Define thermal energy. * Kinetic energy in transit from one object to another due to temperature difference
Define temperature. * The average kinetic energy of particles in an object *
Define absolute zero.
All kinetic energy is removed - 0K

Define thermal equilibrium. Touching objects within a system reach the same temperature

Define the 1st Law of Thermodynamics. Thermal energy can change form and location, but it cannot be created or destroyed.

List two ways thermal energy can be increased in a system. d. Adding thermal energy e. Performing work on the system
Define the 2nd Law of Thermodynamics.
Thermal energy flows from hot to cold.

Define entropy.
The measure of how evenly distributed heat is within a system

Define convection. The transfer of thermal energy by movement of fluid (liquid or gas)

List two examples of convection. f. Weather g. Boiler systems
Define conduction. The transfer of thermal energy within an object or between objects from molecule to molecule

List two examples of conduction. h. Metal spoon i. Heat through a wall * Conduction Equations:

Define the following variables.
Q = Energy transferred

m = Mass of material absorbing or releasing energy

c = Specific heat capacity of a material (J/kg°C)

P = Rate of energy transfer

Δ t = Change in time

Δ T = Change in Temperature

(15-19) A 1kg piece of aluminum metal at 90°C is placed in 4 liters (=4 kg) of water at 25°C. Determine the final temperature (Tf).

List all known...

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