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


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