A 10-minute hot shower might use about 80 liters of water, heated to 45 degrees Celsius. If the water starts at 15 degrees Celsius, how much energy has been put in to heat it to 45 °C? Express your answer in Calories (kcal), calories, Joules, and Btu. How does the answer compare to your daily intake of food energy?

it should be all of them because it asks if you included all of those in your answer

explanation:

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answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.