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- 2 kg of ice at 0oC are placed in a closed glass beaker (k=0.80 W/m-C). The closed beaker is then placed in a 30oC room. The surface area of the beaker is 5x10-3 m2, and its walls are 0.005m thick. How much heat is required to melt the ice? How long does it take the ice to melt?A mass of 50 g of a certain metal at 150° C is immersed in 100 g of water at 11° C. The final temperature is 20° C. Calculate the specific heat capacity of the metal. Assume that the specific heat capacity of water is 4.2 J gʻ¹K¯¹.A soup , with temperature of 60 o C is transferred in a cup with total surface area heated of 0.75 m2. The soup has a . What is the is the temperature, in degree Celsius, of the surface of the cup if the heat transfer if 100 W ? ( h = 150 W/m2-K )
- 500ml of 60oC water at is added to a beaker. Water’s specific heat is 4.186 J/g °C. You have 40ml of and unknown substance that you add to the same beaker. The unknown substance’s specific heat is 14.3/goC The final temperature of the beaker is 45oC. What was the initial temperature of the unknown substance?An insulated beaker with negligible mass contains liquid water with a mass of 0.250 kg and a -femperature of 64.6°Cpercent of a kernel's mass consists of water? Assume that the latent heat of vaporization for stays liquid until its temperature is about 175°C, at which point the kernel ruptures and the a Because of the pressure inside a popcorn kernel, water does not vaporize at 100°C. Instead, it unerheated water turns into steam. How much energy is needed to pop 95.0 g of corn if 14 ater at 175°C is 0.90 times its value at 100°C and that the kernels have an initial temperature of 175°C. Critical Thinking
- On a hot dry day, evaporation from a lake has just enough heat transfer to balance the 1.00 kW/m2 of incoming heat from the Sun. How many kg of water evaporate in 1.25h from each squre meter of the lake, You assume the latent heat of vaporization for water here is Lv= 2414kJ/kg m?A 2.5 kg cast iron pot contains 1.8 L of water at 20oC. How many minutes will it take to boil half away on a 5 kW burner with 40% heat loss. Specific heat of cast iron is 0.46 kJ/kg-K.An iron bucket has a mass of 2 kg and contains 8 kg of water. If the initial temperatureis 6 ° C, to what temp. will the bucket and water be raised by the addition of 3 kg ofwater at 95° C.s.h.c. iron = 500 J/kg° C,s.h.c. water = 4190 J/kg° C
- .A 70Kg runner loses 0.5kg of water each hour through evaporation of perspiration in order to maintain a stable temperature. The latent heat of water at his skin temperature is 2440kJ/kg and the average specific heat of his body is 3.5kJ/kg*K. If he stopped perspiring, how much would his temperature rise in the following 30 minutes?When a material changes phase - liquid, solid, gas- heat exchange is required. This heat is called the Latent heat. is the equation where L is the Latent heat and is material specific. How much heat is required to take water (mass of .55 kg) from -20 to 20 C? L for ice to water is 33.5 * 104 J/kg. the specific heat of ice is 2090 J/(kg*C).and for water is 4186 J/(kg*C).The heat of vaporization of water is 40.7 k/>mol.(a) How much heat (in kilojoules) is required to vaporize3.00 mol of H2O?(b) How much heat (in kilojoules) is released when 320 gof steam condenses?
