A tank contains 80 Ib of salt dissolved in 500 gal of water. The inflow per minute is 20 Ib of salt dissolved in 20 gal of water. The outflow is 20 galmin of the uniform mixture. Inflow 20 galmin Q- 80 Ib V- 500 gal. Outflow 20 gal min The time when the salt in the tank reaches 300 lb is:

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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A tank contains 80 lb of salt dissolved in 500 gal of water. The inflow per minute is
20 Ib of salt dissolved in 20 gal of water. The outflow is 20 gal'min of the uniform
mixture.
Inflow
Q = 80 Ib
V = 500 gal.
20 gal'min
Outflow
20 gal'min
The time when the salt in the tank reaches 300 lb is:
Transcribed Image Text:A tank contains 80 lb of salt dissolved in 500 gal of water. The inflow per minute is 20 Ib of salt dissolved in 20 gal of water. The outflow is 20 gal'min of the uniform mixture. Inflow Q = 80 Ib V = 500 gal. 20 gal'min Outflow 20 gal'min The time when the salt in the tank reaches 300 lb is:
A spring with a mass of 2 kg has damping constant 14 N.Sec /m. A force of 6 N is
required to keep the spring stretched 0.5 m beyond its natural length. The spring is
stretched 1 m beyond its natural length and then released with zero velocity. The
decrease in the amplitude (maximum displacement) đue to damping is:
a. 0
b. (0.35 - 0.4) m
c. (2 - 3) cm
O d. (90 - 100) mm
Transcribed Image Text:A spring with a mass of 2 kg has damping constant 14 N.Sec /m. A force of 6 N is required to keep the spring stretched 0.5 m beyond its natural length. The spring is stretched 1 m beyond its natural length and then released with zero velocity. The decrease in the amplitude (maximum displacement) đue to damping is: a. 0 b. (0.35 - 0.4) m c. (2 - 3) cm O d. (90 - 100) mm
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