Question

The boiling point of water is 100 °C. The temperature of water in a kete
-. 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
(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

Step-by-step explanation:

Given ,

temperature 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°/ 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

step 1

36+(4×10)=76

b step 1

(100+36)÷4

=34