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{SECT 0 {EXCHG {PARA 0 "" 0 "" {TEXT -1 1 " " }{TEXT 256 20 "Rotation \+
worksheet 2" }{TEXT -1 35 " - The moon going around the earth." }}
{PARA 0 "" 0 "" {TEXT -1 162 "First, we must specify the position (and
radius) of the earth -- since we are doing this from the perspective \+
of the earth, the earth is stationary at the origin." }}}{EXCHG {PARA
0 "> " 0 "" {MPLTEXT 1 0 65 "eposx:=0; eposy:=0; earth:=[eposx+cos(s),
eposy+sin(s),s=0..2*Pi];" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 93 "Next \+
we do the moon -- it will rotate around the earth and its orbit will h
ave a radius of 4:" }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "> " 0 ""
{MPLTEXT 1 0 86 "mposx:=4*cos(t); mposy:=4*sin(t);\nmoon:=[mposx+0.5*c
os(s),mposy+0.5*sin(s),s=0..2*Pi];" }}}{EXCHG {PARA 0 "> " 0 ""
{MPLTEXT 1 0 20 "with(plots,animate);" }}}{EXCHG {PARA 0 "" 0 ""
{TEXT -1 60 "Here is the animation of the moon in orbit around the ear
th:" }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 32 "a
nimate(\{earth,moon\},t=0..2*Pi);" }}}{EXCHG {PARA 0 "> " 0 ""
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1 1 }{PAGENUMBERS 0 1 2 33 1 1 }