Consider a cloudless day on which the sun shines down across the United States. If 2247 kJ of energy reaches a square meter (m2) of the United States in one hour, how much total solar energy reaches the entire United States per hour? The entire area of the United States is 9,158,960 km². kJ/h solar energy per hour:

A 31.1-g wafer of pure gold, initially at 69.3 °C, is submerged into 64.2 g of water at 27.8 °C in an insulated container. What is the final temperature of both substances at thermal equilibrium?

A 47.0-g sample of copper at 99.3 °C is dropped into a beaker containing 158 g of water at 18.2 °C. What is the final temperature when thermal equilibrium is reached? (The specific heat capacities of liquid water and copper are 4.184 J/g ⋅ K and 0.385 J/g ⋅ K, respectively.)

A 43.9 g spoon made of pure silver (c = 0.235 J/g C) at 20.1 celcius is used to stir an 8 oz. (240 g) cup of coffee at 9.12 celcius. what is the final temperature of the coffee? Assume that the coffee is an insulated container and the spoon absorbs all of the heat from the coffee, and that the coffee has the same specific heat as water.

A cup with 21.9 g of water is left out in the sun and heats up from 12.2°C to 23.1°C. How much thermal energy did the water in the cup absorb from solar radiation in this example? O 1.12 x 103 J O 1.00 x 103 J 1000.1949 O 21.2 x 103 J

You pour a cup of hot coffee that has a volume of 61.1 mL and is initially 94.4 °C. You place a stainless steel spoon that has a mass of 41.56 g into the coffee until the coffee and spoon are at thermal equilibrium. You record that the temperature of the spoon increases by 16.09 °C. What is the final temperature °C at thermal equilibrium of the coffee and spoon, assuming no heat is lost to the surroundings? Assume the specific heat and density of coffee to be the same as water. The specific heat of the spoon is 0.466 J/g·°C. Report your answer normallly to one decimal place and do not include units.

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A chemist burned a sample of coal in a bomb calorimeter. Her results are below. Calorimeter's Heat Capacity 7.264 kJ/°C Mass of Coal Initial Temperature Final Temperature 0.100 g 22.07°C 25.37°C The sample of coal that the chemist placed in the bomb was dry but when she finished the test there was a small amount of water in the bomb. Where did this water come from and how does it affect her result? The water came from the water surrounding the bomb so her measured heat of combustion is for a closed system. The water was a product of combustion so her measured heat of combustion is for an open system. The water came from the water surrounding the bomb so her measured heat of combustion is for an open system. The water was a product of combustion so her measured heat of combustion is for a closed system.

One hour of bicycle racing can require 500-900 kcal of energy, depending on the speed of the race, the terrain, and the weight of the racer. Tour de France riders must consume abnormal amounts of food to supply this energy. Food in the form of protein or carbohydrates produces 17.0 kJ of energy per gram consumed. How many kilograms of protein or carbohydrate must be consumed to provide the energy for 195 minutes of racing that requires 650.0 kcal/hr. (Recall 1 kcal = 4.184 kJ)

onsider a cloudless day on which the sun shines down across the United States. If 2751 kJ of energy reaches a square meter m²) of the United States in one hour, how much total solar energy reaches the entire United States per hour? The entire area of the United States is 9,158,960 km². solar energy per hour: kJ/h TOOLS x10 218 PM 9/3/2021 64 F Clear ENG