38 2013

Page 1

1. 1.

m=mA

, .

1.

1

mB= 2mA.

, (

1).

2

2

1

: .

.

2.

.

.

.5

.

m

t=0

. ,

.

. .x=-

t

.u= .

t+ ) 2

=-

. K = 1/2

2

t

2

2

3.

.5

t

m

K

f1.

1

f2,

, 1.

f

1,

-

:

. f > f2

. f < f1

. f1 < f < f2.

4.

,

,

.5

: f1=20/

Hz. kA=80 /m, kB=90 /m,

m=0,1Kg

k =160 /m.

: .

k

.

KB

.

.5

k.

2. 1.

1

K1

2

k1=k2/2. 2x

,

x

1

K2

2

,

.

:

. .

1

.

2.

.4 .6

.

2.

f1=98 .

.

1s

:

z

f2=102

z


.

4

100

.

200

.

.4 .6

.

1s

. .

4

100

.

.

:

200

.4 .6

.

3. m=0,2Kg k=80 /m. ,

.

-

-

,

F

= - 0,2u (S.I.). =10 rad/s =0,4m. : . .

:

0=0

.8

.

.6

.

.

.6

.

.

,

.5

.

4. k=600N/m

1,

m1=3kg. m1

m2=3kg, 2,

,

x0=0,2m.

.

t=0 m1

m2 ,

)

. ,

d

)

,

2

,

.8

;

.9

;

)

.8

;

L=2mH R=5

( ( )

). .

t=0

,

LC.

t1=T/6, .

t1 q=+ UB=10-3 J. .

:

C,

: .

.8


. .

. .

.

+

V.

.15 .8 .5


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