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PROJECTILE MOTION Unit=
s 9
primary + 4 & 5 Dr.=
John
P.Cise, Professor Of Physics, Austin Community College, Austin Tx. 78701 jpcise@austincc.edu & New Yotk Times October 3,2008 by Jack Curry
=
=
span>ANAHEIM,
Calif. — Jacoby Ellsbury’s approach as a baseball player is
predicated on speed, so he respects speed down to the decimal point. After
Ellsbury reluctantly admitted that he once ran the 40-yard dash in 4.2 seco=
nds
in college, he noted that it was a split time from a longer sprint.
=
span>Skip to next paragraph
=
span>=
Jacoby Ellsbury diving=
to
catch a fly ball by the Angels’ Mark Teixeira in a 4-1 victory in Gam=
e 1
of their division series. “That’s not official,=
8221;
Ellsbury said. “So put that in there.”
This is official: Ellsbury, the center fielder for =
the Boston Red Sox, is a smooth, slithery pl=
ayer
who can disrupt opponents with his legs. Ellsbury is a pest, a blur of red =
and
blue who wants to do everything he can to create a commotion. He succeeded =
in
being a nuisance as the Red Sox defeated the Angels, 4-1, in the opener of their Amer=
ican
League division series Wednesday night.
Ellsbury,=
25, has
played in only 12 postseason games, so he has a lot more to accomplish befo=
re
he can even peek into Mr. October’s neighborhood. But for now, when
Ellsbury plays in October, he usually thrives and the Red Sox usually win. =
Since Manager Terry Francona inserted Ellsbury into the starting li=
neup
over a fizzling Coco Crisp in Game 6 of the A.L. Championship Series against
the Indians=
last year, he has hit .414 with eight runs scored and five runs batted in a=
nd
the Red Sox have won seven straight playoff games. Other than trying to stay
comfortable, Ellsbury has no magical formulas for succeeding in the vital g=
ames
that have unraveled great players like Alex Rodriguez and Vladimir Guerrero.To make the catch =
on
Teixeira, Ellsbury needed every bit of speed, 4.2 or not, that he had. When=
a
reporter playfully wondered if Ellsbury’s college time might have
actually been 4.3, Ellsbury said, “It could have been 4.1, I don̵=
7;t
know.” He is a speed guy, always respecting the decimal point and usi=
ng
his speed to try to beat the Angels.
Questions: This ball was hit 170 feet to
center field at an initial angle of 45o to the horizontal at home
plate.
(a)&=
nbsp;
Find this balls initial velocity? (b) F=
ind
this balls hang time(time of flight)? (c) How much time did Ellsbury have to
react in catching the ball in the above picture?
Answers: (a) ~ 73.75 ft/s=
(b) ~
3.26 s (c) ~ 0.0407 s
Hint: Be sure to break the
solution page into horizontal and vertical. In this way you will keep the
horizontal variables separate from the vertical variables.
<=
/b>
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