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STATIC & ROTATIONAL EQUILIBRIUM Unit =
15 Dr John P. Cise<=
/b>
Prof. of Physics , Austin Com. Coll=
ege,
1212 Rio Grande St., Austin Tx., 78701 jpcise@austincc.edu & NYT May 3,2009 by Jerry Garr=
ett.
Your Left Foot: Now Left Out
<=
/span>
2009 Porsche 911 Carre=
ra S
Cabriolet. More
Photos >
A PORSCHE, to most people, i=
s a
sports car. To me, it can be a time machine. Even a new Porsche loaded with
technogadgets— a 2009 911 Carrera S Cabriolet, in this case — s=
tirs
fond recollections. Skip
to next paragraphBut my reverie is interrupted as I pull away in a 2=
009
model equipped with a newly domesticated version of Porsche’s PDK
transmission, originally developed for racing. It’s as if someone has
swatted the arm of my phonograph across the record. I was ready to drive th=
is
Porsche, not have it drive me. The PDK (its full name is Porsche
Doppelkupplungsgetriebe, or double clutch gearbox) uses two wet clutches to
shift its seven forward gears with minimal interruption in the flow of powe=
r to
the wheels. Such distinctions aside, say “auf wiedersehen” to
the clutch pedal. Driving a Porsche has often been a daunting experience, b=
est
left to experienced drivers (ideally, holding high-risk insurance). Now, wi=
th
systems like PDK, Porsche Stability Management and Porsche Active Suspension
Management, some of the fear of God has been engineered out.Is this progres=
s?
Along with my lyrical memories of Porsches from bygone eras, there were
terrifying moments, too: Hitting a patch of ice in a 911 — which
typically have a 38-62
front-rear weight balance — while rounding a corne=
r,
feeling the rear end break loose and spinning more times than the Mad Hatter
ride at Disn=
eyland.
Those outings won’t be missed.
Introduct=
ion: The
distance between front(F) wheels and rear(R) wheels is 10 ft. X =3D distance
between
front wheels(stated above as being 0.38 W) and
W(weight) vector which passes through center of mass(CM). QUESTIONs: (a) Find X & R using the front wheels as axis of
rotation? (b) Find X & R using
the CM as axis of rotation? (c) Find X & R u=
sing
the rear wheels as axis of rotation? HINT: Make clear=
free body diagrams. Make use of the conditions for sta=
tic
and rotational equilibrium.
ANSWERS:<=
/span> (a),(b), &(c) X =3D 6.2 feet ,=
R =3D
1240 lbs
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