FzzXIP25S'_[Y- T?3HomeBpC|EarthC@CÌWest wrt EarthEDEfPÒNorth wrt EarthEDC]X West wrt WestEDCPB North wrt NorthEDC>Z West wrt NorthEDEgE?*RNorth wrt WestED6Z'$x HH@Rd(hh @d' EarthC@CÌRV< << (< < ?<??U'b ASystem Center of Mass'Mkg??Dm??rad??CA??KK??mmole??Lcd??Ts??N??ENJ??WWW??CHC????VlV??RV??Hz??Sp?? /s??rad/s??m/s^2??m/s??m^2??kg m^2?? N m^2/kg^2?? N m^2/kg^2?? N m^2/kg^2?? N m^2/kg^2??'@ frame() = 20' 46''A?q?'9-self.mass*( 1.0000000e+0)/sqr(self.p-other.p)*other.massb A'' P!q?'b A''@@q angle(self.v)?'b A''!q?'b A'k>L>>??^qq::?> bAEarth;n;n^k3.'=.$fNb ACircle;n;n^n; =qW=#.$fNb ACircle;n;n^XfgGaG.$fNb ACircle;n;n^mj{?*w>uO.$fMb A Circle ;n;n^>v?%<>k.$fMb A Circle ;n;n^5>?Q=uŒ>G.$fMb ACircleyD bA Button 16yD@bA Button 18yULb A All wrt Earthy~=b A Button 20y~b A Button 21y~Nb A West wrt Westyb ANorth wrt Northy~_b A/West wrt Northy~"b ANorth wrt WestybA Button 14==^.* >>?8ѷbA"West" Cluster==^34?.* >>?8ѷbA#"North" ClusterLb AAnchor34b AAnchor32b AAnchorff;+;+h=9u.*JN^b A4*A demonstration of the apparent motion of $#=b AAnchor%>h=9s.*JN^b A'=local inertial (i.e., "freely falling") reference frames when&%=b AAnchor'>h=9p*.*JN^b A)=viewed from other local or distant inertial reference frames.('=b AAnchor)>h=9D;h|.*JN^b A+CTwo clusters of projectiles are in free fall in different regions. *)=b AAnchor+>h=9k~O.*JN^b A:Choose a reference frame from which to view their motions.,+=b AAnchor->=0?gp.*-:N^b A%.-=b AAnchor/x-?'rrS S A SH AH H  5<, Geneva .+' 1997 , )Ai* A. J. Mallinckrodt % 5AZ* Cal Poly Pomona V   ( Principle of Equivalence{T*b A2Picture2x4?'/w /w A/w H . 's, Geneva .+ Click "Run" and *look ) carefully)9!!Q{0xfb A3Picture@ frame()<13x6?'S S AS H M I, Geneva .+ Now reset and then zoom +in to observe the motion (5 of )either)& cluster from one (Eof three reference frames.{Tlb APicture@ frame()=204?=c>B.-x}N^b A654=b AAnchor6>h=|=$q.*JN^b A-76=b AAnchor