Halliday/Resnick/Walker - Chapter 15
F = kx
~ Hookes Law
F = ma
~ Newtons 2nd Law
A linear restoring force
F = kx
kx = ma
d 2 x(t )
a
dt 2
kx = mx
kx(t ) = mx(t )
"ordinary differential equation"
x is an unknown function of t, but we know that the
2nd
Mock Final Exam
(The real final exam will be substantially cumulative at least of E&M.
This practice exam is not cumulative it focuses on recent work.)
1. The loop shown at right is being pulled away from an infinitely long currentcarrying wire at constan
Ph213, Physics II: Waves and Electromagnetic Phenomena
Professor A. Wolf
Halliday, Resnick, Walker - Chapter 15
Hookes Law:
F = kx
(1)
F~ = m~a
(2)
F = kx
kx = ma
2
d x(t)
kx = m
dt2
kx = m
x
kx(t) = m
x(t) ordinary differential equation
(3)
(4)
Newtons
1. You have two nonconducting spherical shells of radius a and charge Q that are touching.
a. Draw the electric field lines close to and far away from the shells.
b. Find the work that it takes to move the shells infinitely apart.
2. The shaded 2-D figure