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A person consumes about 2700 cal a day. 1 cal = 4186 J, and 1 kWh = 860 cal.
Part a) What is this energy in joules?
a) 1.13 x 10⁷ J
b) 1.37 x 10⁶ J
c) 1.13 x 10⁶ J
d) 1.37 x 10⁷ J

Answer :

Final answer:

The energy consumption in joules for a person who consumes 2700 cal a day is 1.13 x 10⁷ J, after multiplying the calories by the conversion factor of 4186 J/cal.

Explanation:

To convert the daily energy consumption from calories to joules, we use the conversion factor of 1 cal = 4186 J.

Thus, a person who consumes about 2700 cal a day would have an energy intake of:

2700 cal × 4186 J/cal = 11,302,200 J or 1.13 x 10⁷ J

Therefore, the correct answer to the question of what the energy consumption is in joules if a person consumes 2700 cal a day is: a) 1.13 x 10⁷ J

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