Water of mass 1.5kg is heated from from 30^oC to 80^oC using an electric kettle which is rated 5A, 230V. Calculate the time taken to reach the final destination [specific heat capacity of water 4200Jkg^-1K^-1]

4.57 minutes

5.02 minutes

7.30 minutes

10.04 minutes

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king2004

2 years ago

PT=mc∆∅
recall that ∆∅ is t2-t1(80-30) ∆∅ is 50 therefore
5*230*t=1.5*4200*50
1150t=315,000/1150
t =273.91 changing to minutes divide by 60 then you'll get 4.57
so A

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Water of mass 1.5kg is heated from from 30oC to 80oC using an electric kettle which is rated 5A, 230V. Calculate the time taken to reach the final destination [specific heat capacity of water 4200Jkg-1K-1]

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Water of mass 1.5kg is heated from from 30^oC to 80^oC using an electric kettle which is rated 5A, 230V. Calculate the time taken to reach the final destination [specific heat capacity of water 4200Jkg^-1K^-1]