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Please show the worked out problem attached as image. Are the given answers correct? Thank you
question image
Asked by Suneel | 16 Dec, 2018, 01:38: PM
answered-by-expert Expert Answer
Both answers given are not correct. It seems initial temperature added twice.
 
First problem:  (1/2)mv2 = mgh = mCpΔT  ,  Hence ΔT = gh/Cp = (10×1200)/400 = 30°C ; 
                                    final temperature = 12+30 = 42°C
 
2nd problem : (1/2)mv2 = mgh = mCpΔT  ,  Hence ΔT = gh/Cp = (10×1500)/4200 = 3.57°C ;
                                         final temperature = 20+3.57°C = 23.57°C
Answered by Thiyagarajan K | 16 Dec, 2018, 03:40: PM

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