1 1. 2. (1) (2)

1.=2/T=2fTf 2. nv=rr=v/rr

va1ra 4r2rb rcd ( ) A.ab B.ab C.ac D.ad (1) (2)v=ra=v2/r=2r=vC D acCcbv=rcbabAva=vca=2cb=cBd=cdad=d24raaa=a2r=4d2rD

r1r2r31( )A.r11/r3 B.r31/r1C.r31/r2 D.r11/r2

A

2ROB hOB Bv0 (1)Bt R=v0t h=(1/2)gt2 BtT t=nT(n=1,2,) T=2/ (n=1,2) (n=1,2...)

dOabOaOb

(1) mg=mv2/R v= v v v> F=mv2/Rmg vv= ()2 1.

(2)(a) v=0 (a) a.v=0FNFN=mg b.0v F=mv2/Rmgmg-FN=mv2/RmgFN0 c.v= F=mv2/R=mgFN=0 d.v F=mv2/Rmgmg+F=mv2/R (b) a.v=0FNFN=mg b.0v FNmgFN0 c.v= FN=0 d.v

1. 2.F=mv2/R=m2Rv

(1) LhRM sin=h/Ltan=F/(Mg) sintanh/L=F/(Mg)F=h/LMgF=Mv2/R hLR (2) () 2.

v> v