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WORK-ENERGY Unit 11 & 10 Dr. John P. Cise, Professor of Phy=
sics,
Austin Com. College,
1212 Rio Grande St., Austin Tx 78701 jpcise@austincc.edu & NYTimes June 2,2010 by Alastair Macaulay
Please send an e-mail informing me =
of the
use you got from this NYTimes physics application. Thanks! Dr Cise
So far this season, the main story at New York City Ballet has been not the new ballets but the old ones. I have watched two Robbins ballets (“Opus 19: The Dreamer” and “I’m Old Fashioned”) with, amazingly, greater admiration = than I felt with their original casts. In Balanchine’s “SerenadeR= 21; the corps de ballet brought an intensity and a wealth of inflections that h= ad been lacking in the ballet’s last appearances here, and at one performance Teresa Reichlen (in the Russian dance) and Sara Mearns (as the = Dark Angel) were both incandescent.
INTRO=
DUTION:=
This dancer gains 18 inches from leap from floor. His final speed at top of height gained is z=
ero.
The dancer weight is 160 lb. QUEST=
IONS:=
(a)
Find he mass in slugs of the dancer? (b) Find the the dancer’=
;s Gravitational potential energy (PE) after ri=
sing
18 inches? (c) Find the work the dancer had to do to attain the PE? (d) Using work-energy concepts find the danc=
er’s
initial velocity as he leaped off the floor? ANSWERS: (a) 5 slugs, (b) 24 ft lb (c) Work =3D 240 ft lb (d) V0 =3D ~ 9.8 ft/s