πω ω πω ω πω πω

xT (t )
xT (t ) = R sin(ω t − π / 2)
dx(t )
= ω R cos(ω t − π / 2)
dt
dv(t )
= −ω 2 R sin(ω t − π / 2)
aT (t ) =
dt
vT (t ) =
5
R=
m
m
0
0
ϕ (t ) = ω t
ω =π /4
#
!
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R
dA
=
0
0
R
0
R
L(y) dy
A
yT =
=
R
, -#&
#
2 R − y dy
2
2
0
#
A
y 2 R 2 − y 2 dy
)*
y R − y dy
0
R
2
2
++
#
Sx
=
A
y L(y) dy
y dA
#
yT =
R
"
R 2 − y 2 dy
0
&
$&
&
!
'
!
!
"
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