Thermodynamics Speech or Presentation Example | Topics and Well Written Essays - 1250 words

Thermodynamics - Speech or Presentation Example For instance, a rotating flywheel in motion possesses a ‘rotational energy’ which may also be treated a kinetic energy. Once a brake is applied to stop it, then the flywheel comes to rest the moment its kinetic energy is converted to potential energy which the device stores from the previous state of motion. First of all, an internal energy of a thermodynamic system pertains to the sum of all the microscopic energy forms. So, even if the fluid is at rest in a tank, it may possess an internal energy such as with respect to its position in the tank (i.e. altitude/height from the ground), its mass, and the effect of gravity ‘g’ which altogether makes a potential energy for the fluid. Q1.4c A m3 of air at B bar is expanded in a cylinder until the volume is C m3. Calculate the final pressure and the work done if the expansion is polytropic and n = 1.4. If the temperature before expansion is DÂ ° C and Cv = 245 J/kg-K, Find the heat energy transferred during this process. Use R = 810 J/kg-K and draw a P/V diagram for the process. Use your individual values for the above calculations. Fuels of low quality may contribute to rough engine operation. When considering upgrade in the fuel standard to improve engine performance, one must take into account the fuel characteristics which should be reduced or rid of excessive high or low volatility, contaminants, formation of gum, and inadequate octane. Basically, thermal efficiency refers to the difference between the energy content of the fuel consumed and the useful power extracted from the engine. A good thermal efficiency is one with high compression ratio and where fuels used are greatly calorific or at energy much larger than engine power under extraction so that this difference is equivalent to the energy of combustion that is converted to mechanical work which

Homelessness Essay Example | Topics and Well Written Essays - 1750 words

Homelessness - Essay Example Normally, homeless people may be living in cardboard boxes, domestic violence shelter, a homeless shelter, or other temporary housing situation. In this essay, I will show the different life of homelessness between past and present in the world, why people are homeless, the history of homelessness, social science of homelessness, government policy of homelessness and solution for homelessness problem (National Alliance to End Homelessness 2). Homelessness had a different definition in the early century than now. In the 1640s, homelessness was seen as a moral deficiency or a character flaw. It was generally believed that a good Christian under God’s grace would naturally have his or her needs met. During that time, people did not need to pay extra cost on their rent, electricity, water, or other costs that reduced their income as it is today. People would build houses in the village and set up a farm by themselves without paying taxes ((National Alliance to End Homelessness 2). Most of the people could use their talent to support their life. Homeless people were becoming an icon of giving up by the god. In addition, during that time, homelessness was likely an individual issue and it had little impact to the other people (Heidi 1). During the industrial Revolution in the 1820s-‘30s, people began migrating from the farm to the city in search of jobs. For example, Philadelphia and New York had many people walking the streets causing the country’s first panhandling ordinances. City jails became de facto shelter systems. In addition, poor safety regulation caused a lot of physical disability and death. Those disabled and widows, many with dependent children had no means to provide for themselves and nowhere to turn. The 1850s brought the first documented cases of homeless youth, many of whom were kicked out of their homes because their providers could no longer afford to raise and take care of them (Baumohl 24). Homelessness is