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- How will you relate a heat of fusion experiment to the understanding of the physical world?I was hoping that you could check to make sure I’m using the correct units. For some reason I am having a hard time understanding when to use 4186 for specific heat of water or 4.186. For the latent heat of fusion, I have it in kg•cal degrees C. In my book it has it in J/kg. Since the book says it is 3.33 X 10^5, how do I get my answer to show in those terms? Thank you!What do you mean by the term radiation rate?
- If fusion releases more energy than fission, why isn't fusion used as a source of energy on earth? (5-10 sentences)The United States consumes about 2.5x10^-19 J of energy in all forms in a year. How many years could we run the United States on the energy released by a 10^25 J solar fkare?A student performed additional tests, evaluating the effect of shielding materials on a smoke alarm and cream of tartar. Based on your data and the following information, select the minimum level of shielding for each type of radiation.
- What is the source of the most radiation for an average person?Assume that the amount of energy needed to raise the average temperature of the atmosphere by 0.4°C is 2 × 1021J. Estimate how much burned fuel would be needed to give rise to this increase, assuming this was the only cause of changes in the earth's temperature. Hint: Assume that coal has an energy density of 24 megajoules per kilogram.A. 1.00 kg of liquid nitrogen (N2) at its boiling/vaporization point (-195.81 °C) is poured into a large reservoir of liquid water at it fusion/melting point (0.00 °C). How many kilograms of ice (at 0.00 °C) will the evaporation of the liquid nitrogen create (mice = ?)?
- Even when shut down after a period of normal use,a large commercial nuclear reactor transfers thermal energyat the rate of 150 MW by the radioactive decay of fissionproducts. This heat transfer causes a rapid increase intemperature if the cooling system fails 1 watt = 1 joule/second or 1 W = 1 J/s and 1MW = 1 megawatt . (a) Calculate the rate oftemperature increase in degrees Celsius per second (°C/s)if the mass of the reactor core is 1.60 × 105kg and ithas an average specific heat of 0.3349 kJ/kg · °C . (b) Howlong would it take to obtain a temperature increase of2000 °C , which could cause some metals holding theradioactive materials to melt? (The initial rate oftemperature increase would be greater than that calculatedhere because the heat transfer is concentrated in a smallermass. Later, however, the temperature increase would slowdown because the 500,000-kg steel containment vesselwould also begin to heat up.)Calculate the heat that must be supplied to raise the temperature of 2 kg of water from 25∘25∘C to its boiling point at atmospheric pressure.The average specific heat of water in the range 25−100∘C25-100∘C is 4.184 J K−1g−1K-1g-1.(b)How long will a 2 kW heater take to supply this energy?Satellites designed to observe me radiation from cold (3 K) dark space have sensors that are shaded from the Sun, Earth, and Moon and that are cooled to very low temperatures. Why must the sensors be at low temperature?