Question

Latent heat of ice is 80 calorie/gm. A man melts 60 g of ice by chewing in 1 minute. His power is

• A. 4800 W
• B. 336 W
• C. 1.33 W
• D. 0.75 W

Answer 1

The correct option is B 336 W

Work done by man = Heat absorbed by ice = mL = 60 $\times$ 80 = 4800 calorie = 20160 J
$\therefore Power=\frac{W}{t}=\frac{20160}{60}=336W$