Paragraph: By varying the voltage applied to the kettle, you can change power consumption P. Depending on the P kettle with water can be heated to different maximum temperatures. This dependence is shown in Table-1 : Table-2 shows the varia

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Paragraph: By varying the voltage applied to the kettle, you can change power consumption P. Depending on the P kettle with water can be heated to different maximum temperatures. This dependence is shown in Table-1 : Table-2 shows the variation of the temperature with time when the kettle of power 300 W is switched off. The heat capacity of the empty kettle C ₀=100 ~J / K , specific heat of water c =4200 ~J / kg K ,

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Correct answer: D. 0.8 litre

For 1^ st 60 sec , we can use approx method aligned & dT dt = k ~ms + C ₀ ( Ta _ v - T ₀ ) & 5 60 = 5 ~ms +100 [75.5-20 & array l ms +100=3450 ~m 4200=3350 array aligned

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