84. The angular displacements of disks A and B can be written as:
2
1
,.
2
AA
B
B
tt
θω
θ
α
==
(a) The time when
AB
θθ
=
is given by
2
2
2
1
2(9.5 rad/s)
8.6 s.
2
(2.2 rad/s )
A
B
t
ω
ωα
=
¡
=
(b) The difference in the angular displacement is
22
1
9.5
1.1 .
2
A
B
ttt
t
θθ θ ω
Δ= − = −
=
−
For their reference lines to align momentarily, we only require
2
N
θπ
Δ=
, where
N
is an
integer. The quadratic equation can be readily solve to yield
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

Click to edit the document details