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PEOJECTILES Unit 9 Dr. John P. Cise, Professor =
of
Physics, Austin Com. College,
1212 Rio Grande St., Austin Tx. 78701 jpcise@austincc.edu & New = York Times December 1, 2007<= o:p>
Evel Knievel, 69, Daredevil on a Motorcycle, Dies =
Las Vegas News Bur=
eau,
via Associated Press
Evel Knievel’=
;s
famed jump over the fountains at Caesars Palace in Las Vegas in 1967; he was
unconscious for a month afterward. Evel Knievel, the hard-living,
death-defying adventurer who went from stealing motorcycles to riding them =
in a
series of spectacular airborne stunts in the 1960s and ’70s that brou=
ght
him worldwide fame as the quintessential daredevil performer, died yesterda=
y in
Clearwater, Fla. He was 69. Mr. Knievel
amazed and horrified onlookers on Dec. 31, 1967, by vaulting his motorcycle=
151
feet over the fountains of Caesars Palace in Las Vegas, only to land in a
spectacularly bone-breaking crash. By his own account, he underwent as many=
as
15 major operations to relieve severe trauma and repair broken bones —
skull, pelvis, ribs, collarbone, shoulders and hips. “I created the
character called Evel Knievel, and he sort of got away from me,” he s=
aid.
When he was 27, he became co-owner of a motorcycle shop in Moses Lake, Wash=
. To attract
customers, he announced he would jump his motorcycle 40 feet over parked ca=
rs
and a box of rattlesnakes and continue on past a mountain lion tethered at =
the
other end. Before 1,000 people, he did the stunt as promised but failed to =
fly
far enough; his bike came down on the rattlesnakes. <=
span
style=3D'font-size:10.0pt;font-family:"Georgia","serif";mso-fareast-font-fa=
mily:
"Times New Roman";mso-bidi-font-family:"Times New Roman"'>The audience was =
in
awe. “Right then,”=
; he
said, “I knew I could draw a big crowd by jumping over weird
stuff.”
Question: Assume Evil’s jump into the batc=
h of
rattlesnakes was from a ramp that was at a 45 degree angle.
The article above said he went 40 feet into the =
air
vertically at the highest point. With this data find three
Unknowns: (a) Time(t) of flight? (b) Initial vel=
ocity
(v) off the 45 degree ramp? (c) His horizontal range of projection (X)? HIN=
Ts:
Break the solution into horizontal and vertical sections. The vertical moti=
on
of a projectile is the same as a freely falling object dropped. If a projec=
tile
is initially moving vertically up it’s
Vertical component of velocity is the same as a =
object
thrown straight up. The time for a projectile to rise up to the highest poi=
nt
is the same as the time needed to fall down. The horizontal velocity is a
constant for
any
projectile assuming the horizontal force is small. ANSWERS: (a) t =
=3D 3.16
s, (b) V =3D 71 ft/s or 57.7 mph,
(c) X =3D 159 ft.