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