# Epanaliptiko fis3 4 apan

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07-Mar-2016

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• pi pipi 3 4 . 1

1, 2, 3, 4, 5 6) , ) , ) , ), )

1 i) ) ii), : FR= 12

mR2/t= 2FtmR

, L=I=FRt

: FR= mR2/t= FtmR

, L=I=FRt, L=L.

. ii), Lt

==FL-Mg

Lt

.

2. 2= 11 2

2mm m+

1 24= 11 2

2mm m+

12 11 2

m

m m+=1 2

1

m

m0. 2= -24 m/s

-24= 11 2

2mm m+

122m1= -m2 21

m

m=-2 ().

) ..(x): m=(M+2m)VV= 2

3m/s.

..: md=, pi d=(K)=(K), = 25 R2+2m(K)2

=3410-3 Kgm2. pipi : m(K) =

N

T

M M

m

(M+2m)g

d

m

m

V

• pi pipi 3 4 . 2

R=1m/s V= 23

m/s, R> V, pi .

) : : F=(2m+M)T=(2m+M)=(2m+M)(2m+M)g=(2m+M)=g=1m/s2, : = TR= (2m+M)g R=0,22510-1=0,7510-3 =30rad/s2.

) = 12 m2=

120,0536=0,9J,

K=12

2+12(2m+M)V2= 1

23410-3102+ 1

20,225 4

9 K=

780

J.

||= 6580

J pi pi

=

=

6572

=0,9. pi pi

pi pi

, =1- 6572

=7

72=0,1

. ) m : T1-mg=m T1=mg+m (1)

m1:

m1g-2-T=m12= m1g-m1-m1g (2). : (2-1)R= 2

1MR2

R2-1= 2

1M (3).

m1g-m1-m1g- mg-m= 21

M

20-4- 6340

23

-5-0,5=0,5=1m/s2.

S=21t2t=3s, =t=3m/s. W==(2-1)R W= (2-1)S.

pi (1) T1=5,5N pi (2) T2=6N. W=0,54,5W=2,25J.

) pi P= dtdW

=

P=(2-1)R P=(2-1) P=0,53P=1,5J/s.

B) :2-1-=m 2-1-=0 m=0 ( ). =2-1 =0,5.

• pi pipi 3 4 . 3

) pi ... m1 pipi :

...: -=Ww+WT 21

m112-

21

m12= m1gS- m1gS

12-9=210

211,4-2 6

310

231,4 12-9==14-7 12=16 1=4m/s.

= 21

m12 =18j, = 2

1m11

2 =32j. T pi

m1 pi pi

pipi =

-K100%

= 9700

%.

) pi A..: p = p

m22-m11= m22-m11m1(1+1)=m2(2- 2) (1).

pi

: = 21

m112+

21

m222=

21

m112+

21

m222

m1(1-1) (1+1)=m2(2-2) (2+2) (2). (1) (2) 1-1 = -2-2 (3). pi (1) (3) pipi 1 =0 2=-6m/s. |p1|=m11=16gm/s |p1|=0 gm/s. |p2|=m22=4gm/s |p2|=m22=12gm/s. pi

pi:

12

m1 m1m2 m22 1

0

4

8

12

16

P(Kgm/s)

t(s)