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CENTRIPETAL FORCE & GRAVITY=
UN=
ITS 8 & 14
Dr. John P. Cise, Pro=
fessor
of Physics,
&
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Question: This new found plan=
et(Gliese 581e) might be EARTHLIKE. The period(T)of
Gliese 581e about it’s red dwarf star(usu=
ally
about 1/3 the mass of the earth’s sun …..ea=
rth’s
sun mass =3D 2 X 10*30 kg.) <=
span
class=3DGramE>is given below as 13 days and distance(R) from it̵=
7;s
sun as seven million miles. With this planet’s R and T find the mass of this planetR=
17;s
sun?
Hint: Use Kepler’s 3rd
law which comes from Gravity(GmM/R*2)
providing the centripetal force…m V*2/R. Thus…M =3D [4 pi *2/G]
R*3/T*2 . This found planet is exciting. Dr. Cis=
e.
Answer: 0.666 X 10 * 30 kg……this is t=
he
usual mass of a red dwarf.
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New
Planet Could Be Earthlike, Scientists Say
<= o:p>