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  1. Finding speed
  2. damped spring problem using mathematica
  3. Solving Universal law of Gravitation as 2nd order DE
  4. Differential equation Family of curves orthogonal
  5. Newton's Law of Cooling: A corpse was discovered at 2pm....
  6. Find gen. soln to system of ODEs where x' = Ax and....
  7. 2nd order diff. eqn: y''+ 12y'+ 36y=0, y(0)=1, y'(0)=-1
  8. dy/dx = (y- y^2)/ x for all x not zero; verify that y = ....
  9. particular solutin, variation of constants
  10. finding a solution to a second order dif eq
  11. calculating r(t) and theta(t)
  12. find the general soln of dy/dx = (2x^3 + 6)/y
  13. [MOVED] Find gen. soln to dy/dx = (2x^3 + 6)/y
  14. population and rate of growth (logistic function)
  15. inverse Laplace transform of 1/s^5 - (5 - 9s) / (s^2 + 100)
  16. inverse Laplace Transform: (7s^2+20s+53)/[(s-1)(s^2+2s+5)]
  17. Linear independant or dependant?
  18. Help solving 2nd order diff eq.
  19. Differential equation problem
  20. inverse Laplace transform: y''-y = 2t, y(0) = 0, y'(0) = -1
  21. inverse Laplace: y''-y'-2y = e^(2t), y(0) = -1, y'(0) = 0
  22. Eigenvalues
  23. Undetermined Coeff's & solve eqn: y"-3y'-4y = -8e^t
  24. Please Check my Work: y'' + y = 0, y(0) = 0, y(n/2) = 2
  25. General Solution for y"-y'=e^x - sinx
  26. Finding Time of Death
  27. general solution using laplace, convolution
  28. differential equation 42= 3(dT/dt) + 0.03T models temp T of
  29. Springs: spring stretches 0.5 ft when a 2-lb wt is attached
  30. real/complex solutions of planar systems
  31. Spring/Mass systems, did all the work, just need a check.
  32. PLEASE HELP: define a, in terms of B and T
  33. PDE Problem for Exam Tomorrow
  34. finding a solution/ characteristic equation
  35. first order differential equation: x dy + y d = y dy
  36. Two eqns: 3y' + 3xy = e^-3(x^2)/6; x^2 y'' - 3xy' + 3y = 0
  37. help with dy/dx + 4xy - (cos x / e^2x^2) =0
  38. x^2 y'' + 4xy' - 10y = 3/x^5 , x > 0
  39. [SPLIT] y'' - 3y' + 2y = - 6e^{4x}, y(0) = y'(0) = 1, x = 1
  40. differetiation equation dy/dx = e^y*square root (x+1)
  41. 2y'(x) + y''(x) = x : How do I find particular solution?
  42. Differential Equation: dy/dx = x/y^2 with y = 3 for x = 2
  43. [SPLIT] 4y(x) + y''(x) = x has complex characteristic
  44. a little different tank emptying problem
  45. I got stuck: What is t if t + 40 = 10e^(t/60)?
  46. Use seperation variables for 'dy/dx = x/y + y/x + 1'?
  47. A question about LRC Series Circuits
  48. Power series DE
  49. Laplace Transform
  50. Solution for (x^n)(x+k)y'' + Qy=0
  51. Verifying solutions of ODEs
  52. Separable Eqn: y' = (xy + 3x -y -3)/(xy -2x + 4y -8)
  53. 2nd order non-hom. eqn: y'' - 2y' - 3y = x^2 - 1
  54. Solve (x^n)(x + k)y" + Qy = 0 for n, k, Q real values
  55. Solve Cauchey-Euler Eqn x^2 * y" - 2xy' + 2y = 2 * ln(x
  56. Laplace Transform Prob: y"-2y'-3y=1 if y(0)=0, y'(0)=1
  57. System of Differential Eqns: (D-1)x-y=0, (D-4)x+Dy=0
  58. Spring Problem: Without Damping
  59. Find the Recursion Formula (Ck+1) Assoc. w/ power series
  60. Determine Laplace Transform for piecewise function
  61. Inverse Laplace Transform: L-1[(se^-pi*s)/(s^2+4)], etc
  62. Laplace Transforms: transform f(t) = 2t + 6
  63. Distance, Velocity, and Acceleration of a vehicle
  64. Initial Value Prob: y' = (3x^2)/[(3y^2)-4] where y(0)=1
  65. Diff. Equation Help: (1+y^3)y' = x^2
  66. Initial value PDE: the Black-Scholes model (part a)
  67. Initial value PDE: the Black-Scholes model (part b)
  68. Initial value PDE: the Black-Scholes model (part c)
  69. Solve the initial-value problem
  70. Method of undetermined coefficients
  71. Find y(x) for y''(x)-g'(x)y'(x)/g(x)+g(x)^2*y(x)=0
  72. diff eqn word prob: A 95*C cup of coffee is in a 20*C room.
  73. Find Laplace Transform of f(t); solve IVP x'(t)-2x(t)=4f(t)
  74. The derivative of y = e^x is y' = e^x. Why?
  75. Linear Differentiation: 1 = xy = xy', y' - y = 1/x
  76. what is this course about?
  77. pde involving airy function
  78. Undetermined Coefficients/Var. of Parameters: y'' - y' = e^x
  79. Laplace Transforms: ( 100(s+10) ) / ( s(s+5)(s+20) ) and....
  80. Radioactive Decay: Find amount present at any time after....
  81. can't solve y'*(x - ln(y'))=1: tried parameters, but....
  82. Convolution & Laplace Transforms: e^t (u(t))*cost(t)u(t)
  83. initial-value prob: 2y" + 5y' +3y =0, y(0) =3, y'(0)= -
  84. particular solutions, boundary conditions, falling object
  85. implicit differentiation to find y' for 4x^2 + 9y^2 = 4
  86. Annihilarator technique for y'' + 4y' + 4y = 5xy^(-2x)
  87. simple ODE: particular soln of 2ydx = 3xdy, x = 2, y = -1
  88. PDE Separation of Variables: dT/dz+(1/x)*dT/dy+d^2T/dx^2=0
  89. linear equation (general sol'n): (y+1)dx + (4x-y)dy = 0
  90. linear differential eqn: (1+t^2)ds+2t(st^2-3(1+t^2)^2)dt=...
  91. Spectral solving PDE: d^2u/dx^2 + d^2u/dy^2
  92. Differential Equations: why given after calculus 3?
  93. College Math 105 issues...tutor center closed!
  94. Finding homogeneous soln to y'' + 3y' + 2y = sin(2x)
  95. need help w/ 5x2 + 14x - 3 = 0 the 2 means squared
  96. parachute problem
  97. a falling model
  98. verify by differentiation: y' +3y =e^(-t) y(0)=-1/2 for...
  99. Envelope of the family of curves
  100. A differential equation: dy/dx = e^ysinx^x / ysecx