A 83.3 kg mass of copper is melted to be cast into a graphite mold at a copper pipe foundry. If the solid copper starts off at the normal melting temperature of copper and the liquid copper is put into the mold at the crystallization point of copper, how much heat is added to melt the copper?
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A 83.3 kg mass of copper is melted to be cast into a graphite mold at a copper pipe foundry. If the solid copper starts off at the normal melting temperature of copper and the liquid copper is put into the mold at the crystallization point of copper, how much heat is added to melt the copper?
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- An object is placed in water. The object and the water came to the same temperature after coming into contact, but were initially at different temperatures. During this process, if the heat of the water was 125 calories, what was the heat of the object?A hot piece of metal at 100°C with a mass of 65 g is placed into a calorimeter containing 178 g of water at 25°C. According to the "method of mixtures," if the final equilibrium temperature rises to 27.5°C, then calculate the specific heat (c) of this metal, and name the metal type.A solid silver coin (specific heat = 235 J/kg°C) is heated to a temperature of 58.0°C and added to 100. milliliters of 25.0°C water inside a calorimeter. If the water in the calorimeter reaches an equilibrium temperature of 27.0°C after the coin is added to it, what is the mass, in grams, of the silver coin?
- In order to make a cup of coffee, you heat up 0.25 kg of water on the stove. If the water was originally at 24 degrees C and you bring it to boiling temperature, how much heat is transferred to the water in the process?After 28,450 J of heat are added to 500 g of ice at -20 degrees C, how much of the ice melts? Specific heat of ice is 2.01 x 103 J/kgk, and the latent heat of fusion is 334 x 103 J/kg. none of the ice 350 grams 475 grams all of the ice 25 gramsThe figure below, called a heating curve, represents the temperature of a block of ice as thermal energy is added. (The ice melts into water and then vaporizes into steam.) The thermal energy required to change phase from solid to liquid is calculated using the equation Q = mLf, where Lf is called the (latent) heat of fusion. The thermal energy required to change phase from liquid to gas is calculated using the equation Q = mLv, where Lv is called the (latent) heat of vaporization. cice = 2100 J/kg·K; cwater = 4186 J/kg·K; csteam = 2000 J/kg·K; Lf of water = 3.33 x 105 J/kg; Lv of water = 2.26 x 106 J/kgA snowball made of ice at -11.2 degrees Celsius is thrown at a brick wall. Assuming no energy is lost to the wall or surrounding air, how fast would the snowball have to be thrown in order to completely vaporize upon impact? Include units in your answer. More information. REFER TO THE IMAGE FOR CLEARER DIRECTIONS
- How much energy is needed to heat 6.2 kilograms of gold from a temperature of 0 °C up to its melting point of 1064 °C? The specific heat capacity of gold is 0.031 cal/g °C. Give your answer in both calories and Joules.A man consumes 2850 kcal of food in one day, converting most of it to maintain his body temperature. If he loses half this energy by evaporating water (through breathing and sweating), how many kilograms of water evaporate? The latent heat of vaporization of water is Lv = 580 kcal/kg.A bottle containing 6 kg of water at a temperature of 15°C is placed in a refrigerator where the temperature is kept at 5°C. How much heat is transferred from the water to cool it to 5°C?