Question

Work required to generate heat equal to $1kcal$ is

• A. $4.2J$
• B. $4.2\times 10^{3}J$
• C. $4.2\times 10^{7}J$
• D. given by none of the above.

Answer 1

Answer: (B)

W =JQ = (4.2 ) x (1000) = 4.2 x $10^3$ J.