Concept explainers
In Section 9.3 we looked at mixing problems in which the volume of fluid remained constant and saw that such problems give rise to separable differentiable equations. (See Example 6 in that section.) If the rates of flow into and out of the system are different, then the volume is not constant and the resulting
A tank contains 100 L of water. A solution with a salt concentration of 0.4 kg/L is added at a rate of 5 L/min. The solution is kept mixed and is drained from the tank at a rate of 3 L/min. If y(t) is the amount of salt (in kilograms) after t minutes, show that y satisfies the differential equation
Solve this equation and find the concentration after 20 minutes.
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Chapter 9 Solutions
Student Solutions Manual for Stewart's Single Variable Calculus: Early Transcendentals, 8th (James Stewart Calculus)
- EXAMPLE 3 Find S X √√2-2x2 dx. SOLUTION Let u = 2 - 2x². Then du = Χ dx = 2- 2x² = 信 du dx, so x dx = du and u-1/2 du (2√u) + C + C (in terms of x).arrow_forwardLet g(z) = z-i z+i' (a) Evaluate g(i) and g(1). (b) Evaluate the limits lim g(z), and lim g(z). 2-12 (c) Find the image of the real axis under g. (d) Find the image of the upper half plane {z: Iz > 0} under the function g.arrow_forwardk (i) Evaluate k=7 k=0 [Hint: geometric series + De Moivre] (ii) Find an upper bound for the expression 1 +2x+2 where z lies on the circle || z|| = R with R > 10. [Hint: Use Cauchy-Schwarz]arrow_forward
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- 2. [-/1 Points] DETAILS MY NOTES SESSCALCET2 5.5.003.MI. Evaluate the integral by making the given substitution. (Use C for the constant of integration.) x³ + 3 dx, u = x² + 3 Need Help? Read It Watch It Master It SUBMIT ANSWER 3. [-/1 Points] DETAILS MY NOTES SESSCALCET2 5.5.006.MI. Evaluate the integral by making the given substitution. (Use C for the constant of integration.) | +8 sec² (1/x³) dx, u = 1/x7 Need Help? Read It Master It SUBMIT ANSWER 4. [-/1 Points] DETAILS MY NOTES SESSCALCET2 5.5.007.MI. Evaluate the indefinite integral. (Use C for the constant of integration.) √x27 sin(x28) dxarrow_forward53,85÷1,5=arrow_forward3. In the space below, describe in what ways the function f(x) = -2√x - 3 has been transformed from the basic function √x. The graph f(x) on the coordinate plane at right. (4 points) -4 -&- -3 -- -2 4 3- 2 1- 1 0 1 2 -N -1- -2- -3- -4- 3 ++ 4arrow_forward
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