A boxer stops a punch with his head. To approximate the force ofthe blow, treat
ID: 1666619 • Letter: A
Question
A boxer stops a punch with his head. To approximate the force ofthe blow, treat the opponent's glove, hand, and forearm as aparticle of mass 1.47 kg moving with aninitial velocity of 18.0 m/s. (a) Estimate the force exerted on the head ifthe hand moves forward 12.0 cm whiledelivering the blow and then coming to rest.1 N
(b) Estimate the force exerted on the head if the head isdeliberately moved back during the punch so that the hand movesforward 24 cm while decelerating.
2 N (a) Estimate the force exerted on the head ifthe hand moves forward 12.0 cm whiledelivering the blow and then coming to rest.
1 N
(b) Estimate the force exerted on the head if the head isdeliberately moved back during the punch so that the hand movesforward 24 cm while decelerating.
2 N
Explanation / Answer
a ) A mass of a particle is m = 1.47kg moving with a initial velocity v0 = 18.0 m/s , travelled adistance is s = 12.0 cm = 0.12 m using Kinematic equation v2 -v02 = 2as ( 0m/s ) 2 - ( 18.0m/s ) 2 = 2 a(0. 12 m ) a = 135 m/s2 Force exerted is F = ma = 1.47 kg * 135 m/s2 = 198 N b ) using Kinematicequation v2 - v02 =2as distance s = 24 cm = 0.24m ( 0m/s ) 2 - ( 18.0m/s ) 2 = 2 a(0. 24m ) a = 675 m/s2 Force exerted is F = ma = 1.47 kg * 675 m/s2 = 992N Force exerted is F = ma = 1.47 kg * 675 m/s2 = 992NRelated Questions
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