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

    2L. pi 0 pi/2 rad

    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) =

    0,056510-20,5= 3410-37,510-3=0,7510-3=10rad/s.

    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)