Fys tex pspa

Page 1

. :

1. m=mA

1.

, .

1.

1

mB= 2mA.

, (

1).

2

2

1

: .

.

.

2.

m

.

.5

.

t=0

. ,

.

. .x=-

t

.u= .

t+ ) 2

=-

. K = 1/2

2

t

2

2

.5

t

m

3.

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

,

x

k1=k2/2. 2x

.

1

K2

2

, :

. .

1

.

2.

.2


. .3

.

2.

L-C

. UB

q

.

, q1=1 C;

. UE=5mJ

. UE=10mJ

. UE=10

2 mJ

.2 .4

.

f1=98

3.

z

f2=102

.

1s

. .

4

.

100

.

:

200

.2 .4

.

1s

. .

4

.

100

.

:

200

.2 .4

.

4. (1)

(2)

,

. .

;

. 8s

. 16 s

.2 .2

. . .

;

/4

.

/4

.

/4

.2 .2

.

5.

+1) +1) ; .

=

+2.

( =

.

.

( )

)

.2 .3

z


.

3. m=0,2Kg

1.

k=80 /m. ,

.

-

-

,

F

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

0=0

:

.4

.

.5

.

.

.5

.

.

,

4.

C1 L-C1 ( -4 : q1=4 10

(1)

t=

10

-3

1

C2

C2 = 4 C1.

1)

(4 103 t) (S.I.).

s

(2),

L-C2 ( . 1. 2. 3. .

.5

.

2).

: 2.

.5 2

. 1

.5

2.

t=0 C2

.7

.

(2), : L=1mH.

.8


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