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CBSE Class 9 Answered

in a well if we put an empty bucket water gets filled in it till the bucket is in the water we don't feel weight but if we pull the bucket out we feel it is heavy why do this happen when the weight of the bucket is in the water and the weight of the bucket is out.
Asked by | 20 Nov, 2013, 07:04: PM
answered-by-expert Expert Answer
In the water buoyant eorce acts on the bodywhich acts upword which decreases the gravitational force. Hence, the apparant weight of the body in water is not equals to its actual weight.
 
Apparant weight = Actual weight - Magnitude of buoyant force  ........(1)
 
When the bucket is totally filled with water, buoyant force equals the gravitational force.
Hence from eq(1) apparant weight becomes zero and you dont feel its heavy.
 
The moment you pull the bucket outside the water, there is no buoyant force acting on it.
Hence the apparant weight becomes the actual weight and you feel its heavy.
 
For reference refer Halliday Resnick page 369.
 
 
 
 
Answered by Komal Parmar | 21 Nov, 2013, 03:20: PM

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