Energy is being generated by fusion within the sun, so its temperature is not decreasing. What are your answers now?lc99 said:
By the same rationale, what is your assessment of whether Event 3 or Event 4 is possible?dRic2 said:
Chestermiller said:
Oops. Sorry, I mistook you for the OP.dRic2 said:
Kinda got some insight from the above poster. I think event 3 is is possible since heat is moving from hot object to cold object.Chestermiller said:
dRic2 said:
"Sun(1) transfers 58MJ of thermal energy to earth(2)." What about that is unclear?lc99 said:
I'm more confused with the temperatures that they listed in the chart. Why would they use the same numbers for final temp?tnich said:
The heat capacity of Earth's atmosphere is about 1X107J/m2/°C, that is, for each square meter of Earth's surface, it takes 1X107J to change the temperature of the atmosphere above it by 1°C. The radius of the Earth is about 6.4X106m. So how much does 57MJ change the temperature of the atmosphere? (Notice that we are just talking about the atmosphere here, without even considering anything below the surface of the planet.)lc99 said:
What about the heat re- radiated to space. This is pretty much in balance with the heat received from the sun.tnich said:
That is true on average, but daytime temperatures are several degrees higher than nighttime temperatures, so there is a transient warming effect of the sun. My point was to make clear the order of magnitude of the temperature change that 57MJ of energy would cause.Chestermiller said:
Thermodynamics is the branch of science that deals with the study of heat and its relation to other forms of energy, such as work and radiation. It also includes the study of the properties of matter and how they are affected by changes in temperature, pressure, and volume.
The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only transformed from one form to another. This means that the total energy in a closed system remains constant.
The second law of thermodynamics states that the total entropy (measure of disorder) of a closed system always increases over time. This means that in natural processes, energy tends to disperse and become more spread out, causing a decrease in usable energy.
One example of the application of thermodynamics is in the design and operation of heat engines, such as car engines or power plants. These engines use the principles of thermodynamics to convert heat into mechanical energy, which can then be used to perform work.
Thermodynamics is closely related to everyday life, as it governs many natural processes and phenomena. For example, it explains how food is cooked, how refrigerators work, and even how our bodies maintain a constant temperature. Understanding thermodynamics can also help us make more efficient use of energy and reduce waste.
