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Matched Problem 3 Estimate the age of the bone in Example 3 (to the nearest 100 years) if 50% of the original amount of carbon-14 is present.
EXAMPLE 3 Archaeology A human bone fragment was found at an archaeological site in Africa. If 10% of the original amount of radioactive carbon-14 was present, estimate the age of the bone (to the nearest 100 years).
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Calculus for Business, Economics, Life Sciences, and Social Sciences - Boston U.
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- Consider the system of differential equations dx 8 3 x Y dt 4 -- (0) + (1) (음)- (0) dy 18 y. dt For this system, the eigenvalues are help (numbers) Enter as a comma separated list. How do the solution curves of the system above behave? All of the solutions curves would converge towards 0 (sink/stable node). All of the solution curves would run away from 0 (source/unstable node). The solution curves would race towards zero and then veer away towards infinity (saddle point). The solution curves converge to different points. The solution to the above differential equation with initial values x(0) = 5, y(0) = 3 is x(t) = help (formulas) y(t) = help (formulas) Book: Section 3.5 of Notes on Diffy Qsarrow_forwardConsider the system of differential equations Verify that x' x, x(0) = x(t) = c1e5t H + Cze³t [] is a solution to the system of differential equations for any choice of the constants C1 and C2. Find values of C1 and C2 that solve the given initial value problem. (According to the uniqueness theorem, you have found the unique solution of ' = Px, x(0) = 0). H e³t (t) = ( \ ) · e³ {}] + () ·³ [1] Book: Section 3.3 of Notes on Diffy Qs help (numbers)arrow_forwardFind the most general real-valued solution to the linear system of differential equations [5 -6 x = -10|| x(t) [*] [B] • [8] = C1 y(t) In the phase plane, this system is best described as a source/unstable node O sink / stable node saddle center point / ellipses spiral source spiral sink none of these Book: Section 3.5 of Notes on Diffy Qs help (formulas) help (matrices)arrow_forward
- Consider the system of higher order differential equations y″ = t¯¹y' + 7y – tz + (sint)z' + e5t, z" = y — 3z'. Rewrite the given system of two second order differential equations as a system of four first order linear differential equations of the form ÿ' = P(t)ÿ+ g(t). Use the following change of variables y' [Y] Y1 Y2 Y3 LY4_ help (formulas) help (matrices) Book: Section 3.3 of Notes on Diffy Qs [y1(t)] [ y(t)] Y2(t) y' (t) ÿ(t) = = Y3(t) z(t) Y₁(t)] [z'(t)]arrow_forwardCalculate the eigenvalues of this matrix: [21 12 A 24 -21 You'll probably want to use a calculator or computer to estimate the roots of the polynomial that defines the eigenvalues. The system has two real eigenvalues 1 and 2 where \1<\2 smaller eigenvalue \1 = help (numbers) associated eigenvector v1 larger eigenvalue 2 = = help (matrices) help (numbers) associated eigenvector v2 If x' = = B help (matrices) A is a differential equation, how do the solution curves behave? A. The solution curves diverge from different points on parallel paths. B. The solution curves would race towards zero and then veer away towards infinity. (saddle point) C. The solution curves converge to different points on parallel paths. D. All of the solution curves would run away from 0. (source / unstable node) E. All of the solutions curves would converge towards 0. (sink / stable node) Book: Section 3.5 of Notes on Diffy Qsarrow_forwardSuppose x = C1e2t [x(0)] Ly(0). Find C1 and C2. H == + C₂et [ - C1 = help (numbers) C₂ = help (numbers) 3 5 2 1 -3 -2 -1 2 3 -1 -2 -3 A 5 * x = Sketch the phase plane trajectory that satisfies the given initial condition. Which graph most closely resembles the graph you drew? Choose ✰ Is the solution curve headed toward or away from the origin as t increases? A. toward B. away C. neither toward nor away -3 N -1 3 2 1 -1 -2 -3 Book: Section 3.5 of Notes on Diffy Qs 0 3 5 2 1 -3 -2 -1 -1 -2 -3 - B 3 2 2 1 3 x * x * х 2 3 -3 -2 -1 2 3 -1 -2 -3 Darrow_forward
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