Question

Latent heat of ice is80cal/gm.A man melts 60gm of ice by chewing in1 minute. His power is

Answer 1

hey mate

here is your answer

latent heat of ice =80cal/gm

=336j/gm

mass of the ice =60 gm

Time=1 min

=60s

heat energy =336*60

=20160 j

thus,the power=energy /time

=20160/60

=336 watt

Answer 2

First of all:

We assume that ice at 0 C melts to water at 0 C

Then the work done in melting:

Q = L m

==> Q = 80 cal / g * 60 g

==> Q = 4800 cal

1 cal = 4 . 2 J

==> 4800 cal = 4.2*4800 J

==> 20160 J

Now 1 minute = 60 s

So:

Power = work / time

= 20160 J / 60 s

= 336 J / s

=336 W

The power is 336 W.

Hope it helps you

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