Question

The boiling point of water is 100 °C. The temperature of water in a kettle is 36 °C. If the water
in the kettle is heated such that its temperature goes up by 4 °C every minute, find:
(a) the temperature of water in the kettle after 10 minutes.
(b) the time taken for the water in the kettle to boil​

Answer 1

Answer:

Given ,

Thetemperature rises 4° per minute

to find,

a) temp. of water after 10 minutes

    initial temperature = 36°C

    Rate of increase = 4°/ minute

      Time = 10 minute

Final temperature =  36°+(4×10)

                               = 36°+40°

                                =76°C

b) time taken for water to boil

     Final temperature = 100° ( required for water to boil)

    Initial temperature= 36°

    Rate of increase = 4°c/ minute

      final tempt. = initial temperature + (rate × time)

You will find after deriving formulae that

time =( initial + final )/rate of change

time taken = (100+36)/4

                = 136/4

                 = 34

there fore time = 34 minutes

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Answer 2

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