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MOMENTUM CONSERVATION: Unit
12 Dr. John P. Cise,
Professor of Physics,
Austn Com. College, 1212 Rio Grande St., Austin Tx 78701 jpcise@austincc.edu &=
nbsp;
& New York Times
Oct. 10,2009 by Kenneth
Chang. Please write an e-mail
informing me on the format in which you used this application. Thank=
s!
Dr Cise
Intod=
uction:=
Moon mass is 7.35 X 1022<=
/sup>
kg. , 1/14.59 slugs/kg , =
88
ft/s =3D 60 mph. In any collision momentum is conserved: PTOTAL INITIAL =3D =
p TOTAL
FINAL
Question: Consider the moon to be at rest=
.
(a) Find the mass of the moon in slugs? (b) F=
ind
the mass in slugs of the two-ton second stage which collided into the m=
oon?
(c) Find the speed after collision of the moon + 2 ton stage stuck into=
the
moon? ANSWERS:=
span> (a) 0.5037 X 10 22
slug (b) 120 slugs=
o:p>
(c) almost zero HINT:&nbs=
p;
Show your calculations clearly.=
Thanks.
&=
nbsp;
|
|
In Test of Water on
Moon, Craft Hits Bull’s-Eye
This artist's rendering
released by NASA on Friday shows the Lunar Crater Observation and Sensing
Satellite as it crashes into the moon to test for the presence of water.
MOUNTAIN VIEW, Calif. — Scientists who slamme=
d a
bus-size projectile into the Moon<=
/span>
on Friday, hitting exactly the spot they were aiming for, say it will take
weeks to figure out what they did, and did not, see.
At 4:31 a.m. Pacific time (7:31 a.m. Eastern time),=
one
piece of Lcross slammed into the bottom of a crater, excavating hundreds of
tons of the Moon. Trailing four minutes behind, a second piece sent its
observations back to Earth before it also slammed into the same crater.The
absence of a visible plume disappointed the hundreds of enthusiasts who bra=
ved
a chilly evening outside at the NASA Ames Research Center here, which op=
erated
the spacecraft, to watch the live images transmitted from the spacecraft. B=
ut
Anthony Colaprete, the mission’s principal investigator, was ecstatic.
“We got the data we need to address the questions,” he said at a
news conference. Lcross (pronounced L-cross) is a $79 million companion mis=
sion
to the Lunar Reconnaissance Orbiter, sharing the same rocket into space in
June. The mission designers took advantage of what would have otherwise been
space junk — the rocket’s two-ton, =
second
stage — and turned it into a projectile to hit t=
he
Moon, shepherded by a car-size spacecraft. While the orbiter entered orbit
around the Moon, Lcross swung into a wide polar orbit around the Earth that=
, by
design, would intersect with the Moon’s path four months later at 5,600 miles per hour,
or twice the speed of a bullet.The target of Lcross was Cabeus
crater, about 60 miles wide near the south pole. Dr. Colaprete said the Lcr=
oss
spacecraft captured a flash of light as the upper stage hit the bottom of
Cabeus and then captured a thermal image of the resulting crater, about 60 =
to
65 feet wide, close to what had been predicted.
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