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Mechanical Properties Of Fluids

Question
CBSEENPH11019822

A man weighing 60kg starts climbing up after eating 5 bread slices of food value 1000 calories. The efficiency of human body is 0-28. Find the height to which a man can climb up.

Solution

Given here,
Heat released, Q = 1000cal = 4200J 
Efficiency, straight eta equals 0.28           
Therefore, 
Work done,straight W equals eta Q space equals space 0.28 cross times 4200 straight J space equals space 1176 straight J      

Let the man climb up to height h.
Therefore, 
                      space space space mgh equals straight W 
rightwards double arrow         60 cross times 9.8 cross times straight h equals 1176 
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