Thermodynamics Practice Problems A 6-pack of 12 fl. oz. soda cans is placed inside an insulated container. lce is added +e the in order to chill the soda. What is the minimum amount of ice needed in order to coolah doieh 1. od from room temperature (20°C) down to 4°C? Assume the container is a perfect insulat ignore the presence of the cans themselves. Givens: Cice @ -5°C = 2027 kg°C Tinitial (ice) =-5°C Csoda = 4184 kg°C List known values (convert if necessary): 1 fl oz. = 0.0295 L 1L =1 kg List unknown values: anotsupe toels Select equations: avloz bos s u Substitute and solve:

temperature is 330 K. Find the heat loss per unit area and the temperature of the junction of the fire brick and insulating brick? RO 5. In Sohar Petroleum Company, a steam pipeline, with 150 mm ID and 160 mm OD carries steam. The pipeline is surrounded with a layer of heat insulating material (K=0.08 W/m.k) of thickness 100 mm. The temperature drops from 392.8 K to 313 K across the insulating surface. Determine the rate of heat loss per 1 m length of pipe line. ID = 1Somm 160 mm OD,h-loo mm .K=0.08w/m.k %3D 「-392.8 ん/ 12 = 313k = 313 K 2.

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What mass of perspiration must you evaporate each second?

Problem 5: You are on your way to a party when the host asks you to pick up a bag of ice. At the grocery store you grab a 5-kg bag that was kept at a temperature of -5.2°C. When you get to the party, you find a large cooler to put the ice in. There is already 32 L (i.e., 32 kg) of water in the cooler at a temperature of 19°C. You toss the ice into the water and close the lid. The specific heat and latent heat of fusion for water are 4186 J/(kg.C) and 3.34 x 10 J/kg, respectively. The specific heat of ice near its freezing point is 2000 J/(kg.°C). D A Find the temperature, in degrees Celsius, of the water in the cooler after the party. Assume the ice maintains its temperature on the way to the party and the cooler is well insulated. T= sin() cos() tan() 7 8 9 HOME cotan() asin() acos() 4 5 6. atan() acotan() sinh() * 1 2 3 cosh() tanh() cotanh() + END - ODegrees O Radians vol BACKSPACE CLEAR Submit I give up! Hint Feedback

Equal masses of substance A at 98.1°C and substance B at 26.2°C are placed in a well-insulated container of negligible mass and allowed to come to equilibrium. If the equilibrium temperature is 77.4°C, which substance has the larger specific heat? a) substance A     b) The answer depends on the exact initial temperatures. c) More information is required. d) The specific heats are identical.

A 1.50-kg iron horseshoe initially at 650°C is dropped into a bucket containing 13.0 kg of water at 22.0°C. What is the final temperature of the water-horseshoe system? Ignore the heat capacity of the container and assume a negligible amount of water boils away. °C

A sample of 60 grams of water at 56 C is mixed in a styrofoam container with 89 grams of water at 30 C. What is the final temperature of the water? Assume the Styrofoam container is a closed system. 48 C 40 C 38 C 51 C.