PhysicsLAB AP Free Response Question
2009 B5

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Three objects of identical mass attached to strings are suspended in a large tank of liquid, as shown above.
 
 (a) Must all three strings have the same tension? Justify your answer.

Object A has a volume of 1.0 x 10-5 m3 and a density of 1300 kg/m3 . The tension in the string to which object A is attached is 0.0098 N.
 
 (b) Calculate the buoyant force on object A.

 (c) Calculate the density of the liquid.

 (d) Some of the liquid is now drained from the tank until only half of the volume of object A is submerged. Would the tension in the string to which object A is attached increase, decrease, or remain the same? Justify your answer.




 
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