course Phy 231
4/21 2
A ball of mass 400 grams is immersed in water. The ball is suspended in the water by a rubber band chain which exerts a tension force of 2.5 Newtons on the ball. What is the weight of the ball?
answer/question/discussion:
weight = 0.4 kg * 9.8 m/s/s
weight = 3.92 N
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What is the buoyant force on the ball?
answer/question/discussion:
2.5 N 3.92 N + buoyant force = 0
buoyant force = 1.42 N
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What therefore must be its volume?
answer/question/discussion:
v = 1.42 N / 0.0098 N/cm^3
v = 144.9 cm^3
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What is its density?
answer/question/discussion:
density = m/v
density = 400 g / 144.9 cm^3
density = 2.76 g/cm^3
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