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NEWTON’S 2ND LAW Unit 6 & 7 Dr. John P. Cise, Professor of Phy=
sics,
Austin Com. College,
1212 Rio Grande St., Austin Tx. 78701 jpcise@austincc.edu & New York Times October 26,2009 by Kenneth Chang
Please send me an e-mail informing=
me of
the format in which you used this new York Times physics application. Thank=
s!
Dr Cise
INTRODUCTION: T=
he
Ares 1X had rocket with a thrust of 2.96 X 106 lb. QUESTIONS: =
=
(a) Find
the mass of Ares1X? (b) Find the net force on Ares 1X?
(c) Find the acceleration? (d) With the
acceleration found in (c) find its speed after the 120 s burn time
mentioned below? (e) Find the height(miles) reached in the approximate =
burn
time of 120 sec (2 min)?
Note: The article below said it got to
approximately 25 miles. You will find your solution is slightly larger.=
All
these calculations are approximations and seem to come close to numbers
listed in the article bel=
ow.
HINT: 528=
0 ft =3D
1 mile. EXTRA CR=
EDIT:
This
question (e) could be solved using the work-energy theorem:<=
/span>
W =3D F X =3D change in KE + change in PE. S=
olve for
X.
KE =3D1/2 m v2 , PE =3D mgh , giv=
e it a try
!
ANSWE=
RS:=
(a) 5.625 X 104 slug=
s ,
(b) 1.16 X 106 lb.
(c) ~ 20.62 ft/s2 , (d) ~ 2474.7 =
ft/s ,
(e) ~ 28.12 miles ,<=
/o:p>
|
|
New Rocket, but Future of Program Is
Unclear
The first flight in the National Aeronautics and Space Administration’s
program to build a next-generation rocket to replace the space
shuttle could also be the swan song. Skip to next paragraphThe launching of the Ares I-X, a prototype, is
scheduled for 8 a.m. Tuesday. It comes less than a week after a blue-ribbon
panel reviewing NASA’s human spaceflight program released=
its
final report, which offers a less-than-ringing endorsement of the
Ares I rocket and brings the entire program into question. Most of the opti=
ons
explored by the panel look to alternatives from commercial companies to car=
ry
astronauts into Earth orbit.The $450 million Ares I-X is almost the same si=
ze
and shape as the planned Ares I, but with a less powerful first stage and a
dummy second stage. The skinny rocket, towering 327 feet, is the tallest to=
sit
on a launching pad at the Kennedy Space Center in Florida since the 363-foot
Saturn V rockets used for the moon landings in the 1960s and 1970s. The fli=
ght
will be a short one, never reaching orbit. The first stage, which essential=
ly
consists of a spare solid rocket booster from the space shuttle program, will b=
urn
for about two minutes, lifting the 1.8-million-pound Ares I-X eastward to an
altitude of 25 miles. Then the first stage will separate=
and
descend by parachute, while the dummy second stage will continue along its
parabolic arc and dive into the Atlantic. The Ares I is to have a five-segm=
ent
solid rocket motor, compared with the four-segment motors used for the shut=
tle
boosters and the Ares I-X. The first ground =
test of
the five-segment motor was successfully conducted in September in
Utah. Despite the differences
between the two rockets, engineers designed the weight of the second stage =
and
the flight path so that the Ares I-X will experience forces similar to those
the Ares I would experience on its way to orbit.
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