How does a rock suspended in water affect the weight of the water on a scale?

August 31, 2005 3 Comments
rock
Riddler asked:




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3 Comments to “How does a rock suspended in water affect the weight of the water on a scale?”
  1. Arun says:

    scale reading=scale reading when rock is above water surface+buoyant force
    =9.8+1=10.8 N …………Answer
    bye …… tkcr………….

  2. oldprof says:

    The mass of water m = w/g = 9.8/9.81 ~ 1 kg.

    The rock mass M = W/g = 5 kg

    Total mass being weighed by the scale = 6 kg, so the weight on the scale is 58.8 N.

    All that buoyancy stuff has no bearing on how much mass is sitting on the scale.

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