Question

The amount of work, which can be obtained by supplying 200 cal of heat, is

• A. 840 dyne
• B. 840 W
• C. 840 erg
• D. 840 J

Answer 1

Answer: (D)

840 J

Answer 2

$W = JQ$ ⇒ $W = 4.2 \times 200 = 840J$.