This is so because the R- value of polystyrene foam is high so the heat from the outside of fridge or freezer cannot transfer to inside the appliance. 4. High- quality modern homes are very sealed. (a) How does this help conserve energy ? (a) It helps by moisture from outside cannot get into the house (b) What problem might this create?
Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining Table 1: pH of Water Samples | Water Sample | Initial pH | Final pH (24-48 hours) | Pyrite | 4.5 | 5 | Activated Carbon | 4.5 | 6.5 | Water | 4.5 | 4.5 | POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a. Pyrite hypothesis = Adding pyrite to water it will cause the pH levels to increase. b. Coal hypothesis = If I add activated carbon to the water it will lower the pH level of the water.
Then weigh the crucible without the hydrate after heating. Record both masses. Next, add CoCl2 ∙6H2O and weigh the crucible. Now place the hydrate and crucible on the hot plate. Observe the color change while it is being heated.
The insulation and the water heaters of those times was called inadequate by today’s standards. The homes and building of the present times have better insulation, the windows are sealed better and also last way longer then the windows that were around in the 50’s. The homes of today have better technology to keep the house either hotter or colder. The outside doors of the structure are now made of steel which is less drafty and also is easy to lock and secure. The homes from the 50’s had plastic and copper that would fall apart or break easier and more often, and the materials that are used today have a better
As stated by the results above, different fuels produced different amount of energy. According to the data, out of the four different fuels, Cheetos, Wax Candle, Ethanol and Cashew nut, Wax candle produced the most energy (J/g). During the process of the combustion of cashew, there is an error. The flame that is burning the cashew during the second trial is bigger than the other trials, taking less time in burning fuels, causing the results to be inaccurate. If I were to do this experiment again, I would change the number of trials to increase the accuracy of the results.
To what extent do urban areas modify their climate? Urban areas continually try and modify their climate in a number of ways, although it can sometimes been seen as difficult and ineffective. Firstly urban heat islands can be seen to increase climates therefore urban areas are repeatedly trying to reduce the effects of them. Urban Heat Island refers to the tendency for a city or town to remain warmer than its surroundings, by as much as 10 degrees or more. This effect is caused mostly by the lack of vegetation and soil moisture in urban areas, which would normally use the absorbed sunlight to evaporate water as part of photosynthesis, which is known as a process is called evaportranspiration.
However, in problem (b), this is deducted which actually lowers the taxable income and taxes. The rate of return in (a) must be higher to compensate for the opportunity cost of the salary to the owner. Also, giving data only reflects the actual cost, and all costs need to be considered when analyzing the investment. d. Determine the cash flow for 2012 if John serves as the manager and 2012 turns out to be the same as 2011. Do not include the cost of the hired help.
People speculate endlessly about supernatural powers over pain and heat, or mysterious brain chemicals that block the pain and prevent burning. The simple explanation is that the capacity of light and fluffy coals to contain heat is very low, and the conductivity of heat from the light and fluffy coals to your feet is very poor. As long as you don't stand around on the coals, you will not get burned. (Think of a cake in a 450°F oven. The air, the cake, and the pan are all at 450°F, but only the metal pan will burn your hand.
The mechanical power is converted into electricity to power homes and businesses. Wind plants produce electricity that emits zero pollutants. The environmental concern from the wind power plants is minimal; the problems that arise are the noise created from the rotator blades and the killing of birds by flying into the blades. With some technological advances, that issue was drastically reduced. Another major challenge is that the wind does not blow all the time, therefore, the turbines do not spin and no power is created during these
At a cost of $1.61 per square foot the cost of a residential sprinkler system in home would be $3,445.40. There are many claims and assertions to the drawbacks and problems of residential fire sprinklers. One drawback to the systems is that in lower temperature areas the systems can freeze up and therefore not work when needed. According to the National Fire Sprinkler Association (NFSA), the systems, when properly installed, pose no greater risk of freezing over than normal residential plumbing. Also, an antifreeze mix can be added to the system for extra protection against freezing.