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CENTRIPETAL FORCE & GRAVITATION Units=
14 and
9
Dr. John P. Cise, Pro=
fessor
of Physics , Austin Community College, 1212 Rio Grande St., Austin Tx 78701 jpcise@austincc.edu
& NYTimes<=
/span>
March 11,2011&n=
bsp;
by Jascha Hoffman<=
/p>
James Elliot Is Dead at 67; Discovered Rings of Uranus<=
o:p>
James Elliot, an
astronomer who used light from distant stars to study planetary objects
throughout the solar system, leading to his discovery of the rings of Uranus,
died on March 3 at his home in Wellesley, Mass. He was 67.
|
|
QUESTION: G=
ravitational
force keeps
the Rings and any of Uranus’s 23 satellites(we will use the moon
Oberon here) In orbit about Uranus.
Gravity provid=
es the
centripetal force needed. GMummoon/r2
=3D mmoonV2/r
Find the mass of Uranus<=
span
style=3D'font-size:10.0pt;font-weight:normal;text-decoration:none;text-=
underline:
none'> knowing: distance(r) Oberon is from Uranus =3D 583.=
52 X 103
km, Period of Oberon is 13.46 days, G =3D 6.67 X 10-11Nm2/kg2,
V =3D 2 pi/T where T =3D =
period. HINT: pi =3D =
3.1416 ,
convert km to m, convert days to seconds
ANSWER:&nbs=
p;
Muranus =3D 8.68 X 1025
kg
<=
/p>
|
|
James Elliot used the light from distant stars to help discover the =
very
faint rings of the planet.
His daughter Lyn said the cause was complications of
cancer treatment.
Dr. Elliot spent his career, mo=
stly at
the Massachusetts Institute of Technology,
scrutinizing planets by observing how much starlight they blocked. U=
sing
phenomena known as stellar occultations, he cou=
ld
observe changes in the brightness of a star when it was hidden by a planet,
thus determining the planet’s size and the temperature and pressure of
any atmosphere it had. Occultations are rare, a=
nd to
observe them one must predict when the planet will pass in front of a star,=
and
where on the Earth its shadow will be cast. A high degree of coordination is
necessary to ensure that multiple telescopes around the world are trained o=
n a
star at the precise moments that it is obscured by a planet. <=
/o:p>
In 197=
7,
using a telescope in an airplane, Dr. Elliot led a team of Cornell
University scientists to observe the planet Uranus when it passed
between Earth and a star. Flying at night over a patch of the Indian Ocean
where Uranus’s shadow was to be cast, he had the foresight to turn on=
his
equipment more than a half-hour early. This allowed him to record a series =
of
slight dimmings that provided the first evidenc=
e of
Uranus’s rings.
 =
;
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