14-03-12
Clicker ques2on 1:
Which of the following equa2ons has solu2ons
exhibi2ng resonance:
A. y + y = cos(t)
B. y + y = 2 cos(t)
C. y + y = cos(t + 1) - sin(t)
D. All of the above
E. None of the above
T
14-02-28
Todays topics:
Which of the following is NOT a solu:on of
y+ a y = 0
for some value of a?
A. y = 4 sin(2t)
B. y = 8 cos(3t)
C. y = 2 e2t
D. All of these are solu:ons
E. None of the
14-02-14
A. Stable node
B. Unstable node
C. Saddle point
D. Stable spiral point
E. Other
This weeks topics:
S-I model for HIV: I(1975)=10; S(1975)=9990
Infected people
Theory for systems of ODEs
Nonlinear systems: q
14-03-03
Todays topics:
Homogeneous 2nd order problems:
Repeated roots example
Non-homogeneous problems:
Method of undetermined coecients (aka guess
and check)
A harmonic oscillator is modeled by
mx+bx+kx = 0. If
14-03-05
Todays topics:
What will the solu3ons of y + ay + by = c
look like if b is nega3ve and a is posi3ve?
Non-homogeneous problems:
Method of undetermined coecients (aka guess
and check)
A. Solu3ons will