15) 650. J is the same amount of energy as _ A) 155 cal B) 2720 cal C) 650. cal D) 1550 cal E) 2.72 cal
The Correct Answer and Explanation is:
To convert joules (J) to calories (cal), we use the conversion factor: 1 J=0.239 cal1 \, \text{J} = 0.239 \, \text{cal}1J=0.239cal
Given that you have 650 J, the conversion would be: 650 J×0.239 cal/J=155.35 cal650 \, \text{J} \times 0.239 \, \text{cal/J} = 155.35 \, \text{cal}650J×0.239cal/J=155.35cal
So, the closest answer would be A) 155 cal.
Explanation:
The conversion factor between joules and calories comes from the definition of a calorie as the amount of energy required to raise the temperature of 1 gram of water by 1°C. The energy in joules is a more standard SI unit used for measuring energy, while calories are often used in food energy and thermodynamics.
This conversion is crucial in various scientific and practical fields, such as physics, chemistry, and nutrition, where both joules and calories are used to quantify energy.
