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### reviewtest3

Course: MATH 107, Spring 2008
School: UNL
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Word Count: 343

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107-Sec Math 450 Spring 2001 Exam 3 Name: Recitation Instructor: No. score 1 2 3 4 Total 1. (18 pts) Consider the differential equation dy = -y 2 (y - 3). dt a.(4 pts) Find all equilibrium solutions for equation (1) (1) b.(6 pts) Without solving the differential equation, Sketch a reasonable graph of the solution y(t) to equation (1) that satisfies y(0) = 1. c.(8 pts) Use the Euler method with step size...

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107-Sec Math 450 Spring 2001 Exam 3 Name: Recitation Instructor: No. score 1 2 3 4 Total 1. (18 pts) Consider the differential equation dy = -y 2 (y - 3). dt a.(4 pts) Find all equilibrium solutions for equation (1) (1) b.(6 pts) Without solving the differential equation, Sketch a reasonable graph of the solution y(t) to equation (1) that satisfies y(0) = 1. c.(8 pts) Use the Euler method with step size x = 0.5 to approximate the value of y(1), where y(t) is the solution to equation (1) with the initial condition y(0) = 1. (Show your work, no calculator program is permitted) 1 2. (21 pts, 7 pts for each part) Initially, a pool whose volume is 1000 liters is full with fresh water. Assume that water containing 5 grams of salt per liter is pumped into the pool at the rate of 100 liters per minute. The solution in the pool is kept well stirred and the excess water is drained out at the same rate (100 liters per minute). Let y(t) denote the mass of salt the in the pool at time t. a. Write down a differential equation and an initial condition which y(t) must satisfy. b. Solve (or write down the solution of) the initial value problem in part (a). c. At what time does the total amount of salt in the pool reach 3000 grams? 2 3. (13 pts) By using separation of variables, find an explicit formula for the solution to the IVP: 2xy dy = 2 , dx x +1 y(0) = 3. 4. (48 pts, 6 pts for each part) Given the points: A = (-1, 1, 2), B = (1, -1, 0), C = (2, 1, 1). - - a. Find the vectors AB and BC. - - b. Find AB BC. - - c....

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UNL - MATH - 106
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