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    ld.mclemore's Avatar
    ld.mclemore Posts: 2, Reputation: 1
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    #1

    Feb 26, 2012, 09:19 AM
    Need help!
    A scale reads 100N when a piece of aluminum is hanging from it. What does it read when it is lowered so that the aluminum is submerged in water?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
     
    #2

    Feb 26, 2012, 09:28 AM
    It isn't quit that simple. You need to know more about the water. Temp and salt content will alter your reading but always be less than 100n. Bouyancy: Archimedes Principle
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Feb 27, 2012, 01:14 PM
    All you really need to know is how the density () of the water compares to the density of the aluminum. Yes, these densities depend on things like temp (to a small extent) - but I suspect the OP has been given values for these in his/her text book.

    The weight registered by the scale will be equal to:


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