Question
50.4 joule of work is needed to produce 12 cal of heat. Find the value of Joule’s constant. [Ans. 4.2 J/cal]
Answer
To find the value of Joule’s constant, we can use the equation:
Joule’s constant (J) = Work done (in joules) / Heat produced (in calories)
Given:
Work done = 50.4 joules
Heat produced = 12 cal
J = 50.4 J \over 12 cal
Converting calories to joules: 1 cal = 4.186 J
J = 50.4 \over(12 × 4.186)
J ≈ 4.2 J/cal
Therefore, the value of Joule’s constant is approximately 4.2 J/cal.
