What are the three types of heat transfer? Provide a description of each and indicate its key formulas.© BrainMass Inc. brainmass.com October 25, 2018, 8:06 am ad1c9bdddf
The three types of heat transfer are conduction, convection, and radiation.
Conduction is heat passing through a material. Thermal energy can be understood as excited atoms whose vibration motion increases with temperature. The excited atoms collide with the neighboring atoms passing on thermal energy which is gained by it neighbor. This is conductive heat transfer. Also included is thermal energy transfer through diffusion of the atoms. An everyday example can be seen in an egg on a pan. The hot burner of the stove transfers its heat to the pan. The heat moves through the pan material to reach the egg. The heat is then transferred to the egg. This is heat transfer by conduction. It happens through materials and when two objects touch each other.
The main ...
This solution of over 500 words provides an overview of the different types of heat transfer. The basic fundamental equation for each is provided. Examples of where these types of heat transfer occur are also provided. Original text is provided in docx and pdf format.
Asteroid Physics Problems
1. As mentioned before, our asteroid is in the shape of a sphere and has a mass of 1000 kilograms. Determine the density (in grams per cubic centimeter) of this asteroid if its diameter is known to be 1.0 meters. Useful information: 1 kg = 1000 g, 1 m = 100 cm, volume of sphere = 4/3 p r3. Remember that the radius of a sphere is equal to half its diameter! Show all of your work.
2. How does your calculated density (in grams per cubic centimeter) compare to the density of water? Would you expect this asteroid to float or sink in water based on your calculations?
3. One side of our asteroid is constantly illuminated by the Sun while the other side remains in the dark. Do you expect there to be a temperature difference between the light and dark sides? Explain why or why not. If the two sides are at different temperatures, how might heat transfer from one side to the other? Note that our asteroid does not have enough gravity to hold an atmosphere.
4. Occasionally an asteroid will break into fragments due to a collision. These fragments can leave the asteroid belt and some even make their way to Earth. Upon entering the Earth's atmosphere, a fragment is heated to high temperature by frictional forces. What would happen to any water-ice contained within a fragment? Is this type of change considered a chemical change or a physical change? Is this an endothermic or exothermic change? Explain.
5. Asteroids are mainly composed of metals like iron and nonmetals like carbon. Briefly explain the differences between metals and nonmetals based on your knowledge of the periodic table.
6. If the asteroid fragment contains carbon, it may burn when entering the Earth's atmosphere. What is the most likely compound to result from this process? Which type of chemical bond would result from this process? Of the two broad classes of chemical reactions mentioned in this course, which type would this be? Be sure to fully explain all of your answers.View Full Posting Details