In sottball, the pitcher thD WS under hand With the xtended (Staight at the elbuw), In agastpitch the ball, 07 mass m - 0-134 kg, leaves the nand at aspeed 07 139 kmlh,nhen The arm is Pointed verricaIy dunnnard. Rart A:Find the rotational kinetic entrgiin joules,07me PItcher is arm ball system, given that the armis moment Ainertia i50.75 kg•m° and the ball leaver the hand at a distance o7 OoLOsm. Arom the Pivot. KEOT PartB: What 7orce, in newtons,do the muscles exert to cauje the arm To rotate, assuming the torce is constant and s epective perpendicular lever arm is 8 •2 cm? Asjume also that the pitcherss aym starts extend ed norizontaly behind her at rest and the ball is released at the bottom 07 thes mingj as described in part ca Approximate the arm as a uni7urm rodo こ? F=?

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter8: Rotational Motion
Section: Chapter Questions
Problem 92A
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n vottball,the pitcher throws under hand With the arm qully
atended (Straight at the elbun). In agatpitch the ball, 07 mass m -
O-134 Kg, leaves the hand at aspeed 07 139 Km/h,nhen The arm is
fointed verricaIy dunnward.
Part A:Find the rotational kineticenergt,in joules,07me
PItcher is arm ball system, given that the armis moment Ainertia
1s 0.75 kq°m and the ball leaver the hand at a distance o7 OoLOsm
Arom the PiVot.
KE(O+こ?
PartB: What 7orce,in newtons,do the muscles exert to cauje the
arm To rotate, assuming the torce is constant and 15 epective
perpendicular lever arm is do2 cm? ASsume also that thepitcherss
arm starts extended nor120ntalybehind her at rest and the ball s
releascd at the bottom 07theswing as deScYibed in part ca),
Approximate the arm as a unizorm rod.
F=?
Transcribed Image Text:n vottball,the pitcher throws under hand With the arm qully atended (Straight at the elbun). In agatpitch the ball, 07 mass m - O-134 Kg, leaves the hand at aspeed 07 139 Km/h,nhen The arm is fointed verricaIy dunnward. Part A:Find the rotational kineticenergt,in joules,07me PItcher is arm ball system, given that the armis moment Ainertia 1s 0.75 kq°m and the ball leaver the hand at a distance o7 OoLOsm Arom the PiVot. KE(O+こ? PartB: What 7orce,in newtons,do the muscles exert to cauje the arm To rotate, assuming the torce is constant and 15 epective perpendicular lever arm is do2 cm? ASsume also that thepitcherss arm starts extended nor120ntalybehind her at rest and the ball s releascd at the bottom 07theswing as deScYibed in part ca), Approximate the arm as a unizorm rod. F=?
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