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Phy 121
Your 'cq_1_27.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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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: ->->->->->->->->->->->-> :
Wt = 0.4*9.8 = 3.92 N - 2.5 N = 1.42 N
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Wt = 0.4*9.8 = 3.92 N is a true statement
3.92 N - 2.5 N = 1.42 N is a true statement.
0.4*9.8 = 1.42 N is not a true statement.
The weight of the ball is 0.4 kg * 9.8m/s^2 = 3.92 N.
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• What is the buoyant force on the ball?
answer/question/discussion: ->->->->->->->->->->->-> :
0.4 * 9.8 = 3.92 N
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• What therefore must be its volume?
answer/question/discussion: ->->->->->->->->->->->-> :
V = m / d
Since it displaced 400 g of water, then its volume would be 400 cm^3
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There is no reason to suppose that the ball displaced 400 grams of water. Its density is not necessarily equal to that of water.
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• What is its density?
answer/question/discussion: ->->->->->->->->->->->-> :
D = m / v
Its density would be 1 g/cm^3.
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Solution
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