Calculate the heat required to increase the temperature of 630 grams of ice from -2°C to 23°C and turn it to steam with temperature of 124°C. The specific heat of ice is 2. 108 J/(g · °C).
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- For the human body, what is the rate of heat transfer by conduction through the body's tissue with the following conditions: the tissue thickness is 3.00 cm, the difference in temperature is 2.00 , and the skin area is 1.50 m2. How does this compare with the average heat transfer rate to the body resulting from an energy intake of about 2400 kcal per day? (No exercise is included.)4 kg of ice at 0◦C is converted to steam at100◦C.How much heat is needed? The heat offusion for water is 79500 cal/kg, its heat ofvaporization is 5.4 × 10^5cal/kg, and its specific heat is 1000 cal/kg ·◦ C.Answer in units of kcal.x. 62: 1 kg of ice occupies 1.1 × 10 m² al normal pressure. The volume changes to 1.0 x 10 m' when it is melted. Find the internal latent heat of ice. Given : Latent heat of fusion of ice = 80 kcal/kg Density of mercury = 13600 kg/m³, Mechanical equivalent of heat J = 4200 Joules/k cal.
- A hot, just-minted copper coin is placed in 103 g of water to cool. The water temperature changes by 8.22°C and the temperature of the coin changes by 88.1°C. What is the mnss of the coin? Disregard any energy transfer to the water's surround- ings and assume the specific heat of copper is 387 J/kg- C. The specific heat of water is 4186 J/kg- C. Answer in units of g- O1. 122871 O 2. 128.638 O 3. 129.928 4. 116.608 5. 112./99 6. 139 655 8. 111.56 110.329 HO103.949At a foundry, 22 kg of molten aluminum witha temperature of 660.4◦C is poured into amold.If this is carried out in a room containing150 kg of air at 25◦C, what is the temperatureof the air after the aluminum is completelysolidified? Assume that the specific heat capacity of air is 1.0×10^3J/kg ·◦C. The specificheat of aluminum is 899 J/kg ·◦ C and its latent heat of fusion is 3.97 × 10^5J/kg.Answer in units of ◦CA 50 KW electric furnace measure 1.2m x 1.0m x 0.8m. When the temperature insidethe furnace is 1520 o C, a block of aluminum with a mass of 300kg and a temperatureof 16.5 o C is placed inside. Assuming the heat loss from the furnace walls is 500Watts per m 2 , how long will it take to heat the aluminum block to the furnacetemperature? Assume that the specific heat of aluminum is 0.9 KJ/kg-K.
- A 1.50-kg iron horseshoe initially at 600°C is dropped into a bucket containing 20.0 kg of water at 25.0°C. The final temperature of water and iron is 29.5 °C. What is the heat capacity of iron? (Ignore the heat capacity of the container and assume that a negligible amount of water boils away.) Find % error. The specific heat of iron is 448 J/kg °C.A 0.1375-g sample of magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 1769 J °C1. The calorimeter contains exactly 300 g of water, and the temperature increases by 1.126°C. Calculate the heat given off by the burning magnesium, in kJ g-l and in kJ mol-!. The specific heat of water is 4.184 J g1 °C -1.The energy given off as heat by 310 g of an alloy as it cools through 40C° raises the temperature of 310 g of water from 30°C to 40° C. The specific heat of the alloy (in J/kg · C°) is: (Use c of water = 4186 J/kg C°) A surveyor’s 35-m steel tape is correct at 68° F. On a hot day the tape has expanded to 35.03 m. On that day, the tape indicates a distance of 16.50 m between two points. The true distance between these points is:
- Calculate the total heat required to convert 100 g ice at -15°C to steam at 120 "C. (Specific heat of ice = 2090 J/kg °C, Specific heat of water= 4186 J/kg "C, Specific heat of steam = 2.01x10 J/kg C, Latent heat of fusion of ice = 3.33 x 10 J/kg, Latent heat of vaporization of water = 2.26 x 10 J/kg.)18 grams of some unknown material is submerged in 325 grams of water initially at 16.8℃. If the final temperature of the mixture is 21℃, calculate the specific heat of the unknown material assuming the original temperature of the unknown is 245℃. Assume the specific heat of water is 1 cal/g-℃.The heat required to melt a block of ice is 1165500 J. Estimate the total heat required to vaporize the same mass of water that is at 50 °C. ( Cwater = 4186 J/kg.°C, Lf = 3.33 × 105 J/kg, and Lv = 2.26 × 106 J/kg.)