Figure TQ3.5 shows a simple pendulum of length lh has a bob of mass m1. Another simple pendulum of length l; and having a bob of mass m; is suspended from mj. Show that the two natural frequencies of oscillation are given by the equation m, + m²\w² , m, + m2 _ 0 m2 Figure TQ3.5 Determine the natural frequencies of this system and compare the amplitude of m; and m, for each frequency. Work from first principles] m; = 1kg m; = 1.5kg 4 = 1.0m l, = 1.5m

Elements Of Electromagnetics
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ChapterMA: Math Assessment
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Figure TQ3.5 shows a simple pendulum of length li has a bob of mass mj. Another
simple pendulum of length l, and having a bob of mass m; is suspended from m1.
Show that the two natural frequencies of oscillation are given by the equation
mị + m2 – 0
-(
.+ 1½\/m1 + m,\w²
T2
T2
m2
Figure TQ3.5
Determine the natural frequencies of this system and compare the amplitude of m; and
m, for each frequency. Work from first principles.
1 = 1.0m
l2 = 1.5m
m; = 1kg
m2 = 1.5kg
Transcribed Image Text:Figure TQ3.5 shows a simple pendulum of length li has a bob of mass mj. Another simple pendulum of length l, and having a bob of mass m; is suspended from m1. Show that the two natural frequencies of oscillation are given by the equation mị + m2 – 0 -( .+ 1½\/m1 + m,\w² T2 T2 m2 Figure TQ3.5 Determine the natural frequencies of this system and compare the amplitude of m; and m, for each frequency. Work from first principles. 1 = 1.0m l2 = 1.5m m; = 1kg m2 = 1.5kg
Example C07.07
but
T,스 mag and T스mg+ T스 (Mi + ma)g
(m, + m2)9,, + m(72 – 21)
Question
also
A simple pendulum of length l; has a bob of mass mj. Another simple pendulum of
(3)
length lz and having a bob of mass m, is suspended from mį.
Show that the two natural frequencies of oscillation are given by the equation
and
(4)
14+1\/m, + m\o m1 + m2 -0
Assuming that x, = a, cos ot and x, = a, cos ot, equation (3) becomes
-m,a,o² cos ost = - m1 + m2)g
(a, cos cot – a, cos ot)
a, cos cot +
m,, 41 – (m1 + m)g az _ m29(1
mag/.
i.e.
(5)
Solution
ag
Let the small angular displacements of the upper and lower pendula be 01 and 02
and equation (4) becomes
respectively and let the corresponding linear displacements of mi and m, be xi and x2
respectively, Figure Q7.7.
-m,a,0? cos wt = -
ma la, cos ot - a, cos wt)
i.e.
-1-4
(6)
Substituting for 4 in equation (5),
az
= M.
i.e.
-mla +
+ m2
4+2\m, +
1,1,
i.e.
+ m1 + m2 =0
g
Figure Q7.7
NOTE : The ratio of the amplitudes may be obtained from equation (6)
Then, if T, and Tz are the tensions in the two strings, the equation of motion of mị is
m =-T,01+ T',0, .
• (1)
and the equation of motion of m, is
- -T,0,
(2)
Transcribed Image Text:Example C07.07 but T,스 mag and T스mg+ T스 (Mi + ma)g (m, + m2)9,, + m(72 – 21) Question also A simple pendulum of length l; has a bob of mass mj. Another simple pendulum of (3) length lz and having a bob of mass m, is suspended from mį. Show that the two natural frequencies of oscillation are given by the equation and (4) 14+1\/m, + m\o m1 + m2 -0 Assuming that x, = a, cos ot and x, = a, cos ot, equation (3) becomes -m,a,o² cos ost = - m1 + m2)g (a, cos cot – a, cos ot) a, cos cot + m,, 41 – (m1 + m)g az _ m29(1 mag/. i.e. (5) Solution ag Let the small angular displacements of the upper and lower pendula be 01 and 02 and equation (4) becomes respectively and let the corresponding linear displacements of mi and m, be xi and x2 respectively, Figure Q7.7. -m,a,0? cos wt = - ma la, cos ot - a, cos wt) i.e. -1-4 (6) Substituting for 4 in equation (5), az = M. i.e. -mla + + m2 4+2\m, + 1,1, i.e. + m1 + m2 =0 g Figure Q7.7 NOTE : The ratio of the amplitudes may be obtained from equation (6) Then, if T, and Tz are the tensions in the two strings, the equation of motion of mị is m =-T,01+ T',0, . • (1) and the equation of motion of m, is - -T,0, (2)
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