J is the same amount of energy as __. Select one: a. 2720 cal b. 1550 cal c. 2.72 cal d. 650. cal e. 155 cal
The Correct Answer and Explanation is:
The correct answer is a. 2720 cal.
To convert joules (J) to calories (cal), we use the conversion factor:
1 calorie (cal) = 4.184 joules (J).
So, to convert 650 joules to calories, the calculation is: 650 J×1 cal4.184 J≈155.4 cal650 \, \text{J} \times \frac{1 \, \text{cal}}{4.184 \, \text{J}} \approx 155.4 \, \text{cal}650J×4.184J1cal≈155.4cal
Therefore, 650 joules is approximately equal to 155.4 calories, which matches closest to option e. 155 cal.
The confusion may arise because the answer choices and conversion seem mismatched when viewed at first glance. However, the exact match for 650 joules converted into calories is 155 cal, not 2720.
