Question
Find the power of a person who can chew 30 g of ice in one minute. Latent heat of ice = 80 cal/gm
Solution
Mass of ice chewed, m = 30 g
Time taken, t = 1 min = 60 sec
Latent heat of ice, L = 80 cal/g
Heat produced = mL = 30 x 80
= 2400 cal
= 2400 x 4.2 J
Now, using the formula for power
Power = Work / Time taken
power, P = 
