Question 20 of 23 2 Points 20. A 2.20-kg iron pot contains 3.00 kg of water, all initially at 25.0 C. A hot iron horseshoe with a mass of 463 grams is dropped into the water. After the pot, horseshoe, and water all reach thermal equilibrium, the final temperature of all three is 33.0'C. What was the initial temperature of the hot horseshoe, in degrees Celsius? "C (Laulima contain a unique randomized value for the horseshoe mass.) Assume rapid heat transfer within the system, and that the system is fully insulated from its surroundings. Specific heat capacities: Giron = 450. J/(kg.K) (water = 4186 ]/(kg.K) . Calculate and enter your final answer to at least 3 significant figures. There is no penalty for including too many significant figures, but rounding to too few sig figs may cause Laulima to judge your answer to be wrong. . Do NOT enter units with your answer; enter only a numerical response. Laulima will count non-numerical answers as incorrect. . Partial credit is NOT possible. Mark for Review What's This? Question 21 of 23 2 Points 21. How much total heat is required to transform 1.55 liters of liquid water that is initially at 25.0'C entirely into H20 vapor at 100. C? Convert your final answer to megajoules. MJ (Laulima contains a unique randomized value for the volume of water.) Assume rapid heat transfer within the system, and that the system is fully insulated from its surroundings. Physical values for H20, although you may not need to use all of them: Cliquid water = 4186 J/(kg.K) Lf = 334,000 J/kg Lv = 2,256,000 J/kg . Calculate and enter your final answer to at least 3 significant figures. There is no penalty for including too many significant figures, but rounding to too few sig figs may cause Laulima to judge your answer to be wrong. . Do NOT enter units with your answer; enter only a numerical response. Laulima will count non-numerical answers as incorrect. . Partial credit is NOT possible.Question 22 of 23 2 Points 22. How much total heat is needed to fully melt 18 kg of silver, if the silver starts as a 25.0'C solid? Convert your final answer to megajoules. MJ (Laulima contains a randomized value for the mass.) Assume rapid heat transfer within the system, and that the system is fully insulated from its surroundings. Physical values for silver: Tmelt = 961 C Csolid Ag = 230. J/kg.K Lf= 88.0 kj/kg . Calculate and enter your final answer to at least 3 significant figures. There is no penalty for including too many significant figures, but rounding to too few sig figs may cause Laulima to judge your answer to be wrong. Do NOT enter units with your answer; enter only a numerical response. Laulima will count non-numerical answers as incorrect. . Partial credit is NOT possible. Mark for Review What's This? Question 23 of 23 1 Points Click to see additional instructions 23. A particular sidewalk in a northern city is made up of a series of 1.5-meter-long stone slabs, whose coefficient of thermal expansion is 2.1x10-5 K-1. If the city's coldest winter temperatures are typically -22 C, and its warmest summer temperatures are typically 34"C, how much does each slab's length change as it undergoes these extremes? Convert your final answer to millimeters: mm . Calculate and enter your final answer to at least 2 significant figures. There is no penalty for including too many significant figures, but rounding to too few sig figs may cause Laulima to judge your answer to be wrong. . Do NOT enter units with your answer; enter only a numerical response. Laulima will count non-numerical answers as incorrect. . Partial credit is NOT possible