How does a rock suspended in water affect the weight of the water on a scale?
Monday, February 8th, 2010 at
5:13 am
A 5 kg rock suspended above water weighs 49 N. When suspended beneath the surface of the water, its apparent weight is 48.0 N. The buoyant force on the rock is 1 N. The scale reading when the rock is released and rests at the bottom of the container is 58.8 N.
If the container of water on a bathroom type scale weighs 9.8 N, what is the scale reading when the rock is suspended beneath the surface of the water?
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Filed under: Water Filter System
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is it 59.8 N?
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.
scale reading=scale reading when rock is above water surface+buoyant force
=9.8+1=10.8 N …………Answer
bye …… tkcr………….