answer a and b......
Answers
(a) This is because of buoyant force exerted by the water upon the bucket.
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(a).while the bucket is in watre there are two forces avcting on it.one is we are pulling it upwards other is the buoyant force of water as the bucket comes out of water no buoyant force is acting and we feel all the weight of bucket.
(b).Buoyancy:- The upthrust on a body is equal to weight of the volume of the liquid displaced by that body.
The density of sea water is more than river water because of presence of a number of salts dissolved in it. The average salinity of the oceans is 35gms per 1000ml of water. When the ship enters the sea, the water is no more the river fresh water but the saline sea water which is denser. As a result the weight of water displaced is now more than what it was previously when the ship was in river. The upthrust increases and the ship rises up.
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