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What is the weight of a bucketful of water?

  1. Sep 30, 2015 #1
    1. The problem statement, all variables and given/known data

    A helicopter is used to fill buckets with water to drop on fires. The bucket is a hemisphere with a diameter of 2 meters and a mass of 25 kg. The helicopter lowers the bucket into a lake or reservoir to fill it

    a) What is the weight of a bucketful of water?



    2. Relevant equations




    3. The attempt at a solution

    Do I actually need to find how much water weighs?
    Or can i just find the weight of the bucked using W=25kg(9.8)

    Thanks.
     
  2. jcsd
  3. Sep 30, 2015 #2

    haruspex

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    It says a bucketful of water, so of course you need the weight of the water that would fill the bucket.
    What is less clear is whether you should add the weight of the bucket. I expect it intends that you should, but in that case it is worded wrongly. It should ask for the weight of a "bucket, full of water". A bucketful is a measure of volume (for a given bucket), so strictly speaking a bucketful of water just refers to the water in the bucket, not the water plus the bucket.
     
  4. Sep 30, 2015 #3

    CWatters

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    It asks for the weight of a bucketful of water so I would include the bucket.
     
  5. Oct 4, 2015 #4
    Thank You all :)
     
  6. Oct 4, 2015 #5

    haruspex

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    I can eat a spoonful of sugar, but not a spoon full of sugar.
     
  7. Oct 4, 2015 #6
    Not unless you want to take a trip to the emergency room.
     
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