Questions # 18-19: A particular kitchen blender delivers 1100 watts of mechanical power while blending the mixed fruit i

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Questions 18 19 A Particular Kitchen Blender Delivers 1100 Watts Of Mechanical Power While Blending The Mixed Fruit I 1 (73.02 KiB) Viewed 53 times

Questions # 18-19: A particular kitchen blender delivers 1100 watts of mechanical power while blending the mixed fruit in its carafe to make a smoothie. Assume that 100% of this power is absorbed by the food as the blades spin. 18. (1 pt.) If the blender runs for 23 seconds, what is the total energy, in kilojoules, delivered to the food? 19. (1.5 pts.) If the food has a total mass of (1.0-2.0) kg and an average specific heat capacity of (3.0-4.0) kJ/(kg-K), what is the average temperature increase of the food, in degrees Celsius? (Laulima will contain randomized values within the ranges shown.) Assume rapid heat transfer and mixing within the food, and that 100% of the heat remains in the food. Assume no phase transitions for the food. 20. (2 pts.) 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 (300.-600.) 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? (Laulima will contain a randomized value within the range shown.) Assume rapid heat transfer within the system. and that the system is fully insulated from its surroundings. Specific heat capacities: Ciron 450. J/(kg-K) water 4186 J/(kg-K) 21. (2 pts.) How much total heat is required to transform (1.00-2.00) liters of liquid water that is initially at 25.0°C entirely into H₂O vapor at 100, "C? Convert your final answer to megajoules. (Laulima will contain a randomized value within the range shown.) Assume rapid heat transfer within the system, and that the system is fully insulated from its surroundings. Physical values for H:0, although you may not need to use all of them: Cliquid water-4186 J/(kg-K) Lr=334,000 J/kg L. = 2,256,000 J/kg 22. (2 pts.) How much total heat is needed to fully melt (10.0-20.0; kg of silver, if the silver starts as a 25.0°C solid? Convert your final answer to megajoules. (Laulima will contain a randomized value within the range shown.) Assume rapid heat transfer within the system, and that the system is fully insulated from its surroundings. Physical values for silver: Timel=961°C Cold Ag 230. J/kg-K L=88.0 kJ/kg 23. (1 pt.) 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 2.1 x 10 K. 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.