a heater takes 4 minutes to melt 100 gm 0°C ice to 0°C water. how much time it takes to bring 100gm water at 0°C to 100°C water
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Explanation:
Given: m=100g,t=2 minutes=2×60 sec.
Heat energy taken by ice at 0
∘
C to convert to water at 0
∘
C.
Q=mL=100×336=33600 J
∴P=
t
Q
=
2×60
33600
=280 J/S
The heat energy required to convert water at 0
∘
C to 20
∘
C.
Q=mc△t=100×4.2×20=8400 J
Q=P×t
8400=280×t
t=30sec=0.5 min
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