A 0.25kg mass of liquid mercury initially 300°C is placed in an insulating closed container.  The lid of the container is briefly lifted to insert a mass of copper initially at 390°C, causing all of the liquid mercury to undergo a phase change.  What mass of copper was added if the system thermalizes at the boiling point of mercury?

Question 11 After some time, you pour 0.5 kg of milk, whose initial temperature was 5°C. What will be the final equilibrium temperature of this system? Let: 1.5 kg of coffee, originally at 90°C, is placed into a .3 kg aluminum cup. J Ccoffee = 4186 kg K J CAI = 500 kg K J CMilk = 3000 kg K Question 12 A solid steel sphere of radius 50 acts as a perfect radiator, calculate the amount of heat it will radiate after 1 min. cm is heated to 3000 K. If the sphere

How many grams of coffee must evaporate from 700 g of coffee in a 190 g glass cup to cool the coffee and the cup from 95.0°C to 24.0°C? Assume the coffee has the same thermal properties as water and that the average heat of vaporization is 2,340 kJ/kg (560 cal/g). Neglect heat losses through processes other than evaporation, as well as the change in mass of the coffee as it cools. g Do the latter two assumptions cause your answer to be higher or lower than the true answer? O My answer is lower than the true answer because, if coffee loses heat in other ways and its mass decreases, it will need more evaporation for the same temperature drop. O My answer is higher than the true answer because, if coffee loses heat in other ways and its mass decreases, it will need less evaporation for the same temperature drop. O My answer is higher than the true answer because, if coffee loses heat in other ways and its mass decreases, it will need more evaporation for the same temperature drop. O My…

A highway is made of concrete slabs that are 12.2 m long at 20.0°C. Expansion coefficient of concrete is α = 12.0 × 10−6 K−1.   If the temperature range at the location of the highway is from −20.0°C to +32.7°C, what size expansion gap should be left (at 20.0°C) to prevent buckling of the highway? answer has to be in mm.