Structural Analysis
Structural Analysis
6th Edition
ISBN: 9781337630931
Author: KASSIMALI, Aslam.
Publisher: Cengage,
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please help me with these, advance thank you. :D 

13. Free settling of sludge is 0.25 cm/min. Using an original height of 25 cm, the sludge
settled to height of 18 cm after the free-settling period. The sludge was found to settle
to a height of 10 cm after 110 min. This particular sludge was found to settle
completely to a height of 4 cm. The time to settle to a height of 1/5 of its original
height in a cylindrical tank whose diameter is 85% of its depth if it is 85% full and
consider 1000 cu ft of sludge in the tank is
a. 62.4 hours
b. 54.2 hours
c. 46.2 hours
d. 65.4 hours
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Transcribed Image Text:13. Free settling of sludge is 0.25 cm/min. Using an original height of 25 cm, the sludge settled to height of 18 cm after the free-settling period. The sludge was found to settle to a height of 10 cm after 110 min. This particular sludge was found to settle completely to a height of 4 cm. The time to settle to a height of 1/5 of its original height in a cylindrical tank whose diameter is 85% of its depth if it is 85% full and consider 1000 cu ft of sludge in the tank is a. 62.4 hours b. 54.2 hours c. 46.2 hours d. 65.4 hours
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