A tank initially contains 60 gallons of pure water. Brine containing 1 lb of salt per gallon enters the tank at 2 gal/min, and the perfectly mixed solution leaves the tank at 3 gal/min; thus the tank is empty after exactly 1 h. (a) Find the amount of salt in the tank after 20 minutes. (b) What is the maximum amount of salt ever in the tank?

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Solve using applications of first order ordinary differential equations

A tank initially contains 60 gallons of pure water. Brine containing 1 lb of salt per gallon enters the tank at 2
gal/min, and the perfectly mixed solution leaves the tank at 3 gal/min; thus the tank is empty after exactly 1 h. (a)
Find the amount of salt in the tank after 20 minutes. (b) What is the maximum amount of salt ever in the tank?
Transcribed Image Text:A tank initially contains 60 gallons of pure water. Brine containing 1 lb of salt per gallon enters the tank at 2 gal/min, and the perfectly mixed solution leaves the tank at 3 gal/min; thus the tank is empty after exactly 1 h. (a) Find the amount of salt in the tank after 20 minutes. (b) What is the maximum amount of salt ever in the tank?
A constant inductance of 1 henry and a variable resistance R are connected in series with a constant emf of E
1
ohms at time t seconds and if the current is initially zero, what value of E will make the
volts. If R =
1+t
current 24 amperes after 4 seconds?
Transcribed Image Text:A constant inductance of 1 henry and a variable resistance R are connected in series with a constant emf of E 1 ohms at time t seconds and if the current is initially zero, what value of E will make the volts. If R = 1+t current 24 amperes after 4 seconds?
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