Phy 231
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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 = .4kg * 9.8m/s^2 = 3.92N
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• What is the buoyant force on the ball?
answer/question/discussion: ->->->->->->->->->->->-> :
Weight + Tension + Buoyancy = 0
-3.92N - 2.5N + B = 0
Buoyant force = 6.42N
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• What therefore must be its volume?
answer/question/discussion: ->->->->->->->->->->->-> :
Volume = 6.42 cm^3
This would be the case if a cm^3 of water weighed a Newton. However a cm^3 of water weighs much less than a Newton.
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• What is its density?
answer/question/discussion: ->->->->->->->->->->->-> :
D = mass/volume
D = 400g / 6.42 cm^3
D = 62.3 g/cm^3
#$&*
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20 minutes
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