in the bernoulli s principle why is work done on other end is taken negative

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Solution

$W o r k d o n e i s n o t t a k e n a s n e g a t i v e . A t t h e o t h e r e n d, h e i g h t o f t h e t u b e d e c r e a s e s d u e t o w h i c h p r e s s u r e d e c r e a s e s c o m p a r e d t o t h e o t h e r s i d e . W e k n o w w o k d o n e c a n b e e s t i m a t e d a s t h e c h a n g e i n p r e s s u r e \times v o l u m e . \sin c e f i n a l p r e s s u r e i s l e s s t h a n t h e i n i t i a l t h e r e f o r e w e s u b s t r a t t h e t w o w o r k d o n e .$

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