Question

When energy expressed is 10 calories, it is equal to:

• A. 41.86 J
• B. 4.186 J
• C. 418.6 J
• D. 0.4186 J

Hint:

To convert calories to joules, use the formula: \( \text{Energy (J)} = \text{Energy (cal)} \times 4.186 \).

Answer 1

The Correct Option is A

Step 1: Understanding the calorie-to-joule conversion
A calorie is a unit of energy commonly used in thermodynamics. The conversion factor is: \[ 1 \text{ cal} = 4.186 \text{ J} \]
Step 2: Calculating the energy in joules
For 10 calories: \[ 10 \times 4.186 = 41.86 \text{ J} \]
Step 3: Eliminating incorrect options
- \( 4.186 \) J corresponds to 1 cal, not 10 cal. - \( 418.6 \) J is obtained by multiplying by 100 instead of 10. - \( 0.4186 \) J is a result of dividing instead of multiplying.