An athlete shown in the picture below performs various physical exercises. The p

Question

An athlete shown in the picture below performs various physical exercises. The parameters of the athlete are as follows. The height from the floor to the palm of the hands raised overhead is H=2.27m, the length of the torso from hips to shoulders is h=0.8m, the length from the hip to the knee is w=0.6m, and the height from the floor to the hip is k=1.07m. The diameter of the plate on the barbell is L=0.54m. The athlete performs two movements: a 315lb deadlift and a 126lb clean and jerk. For the deadlift the athlete raises the barbell loaded with plates from the floor to the hips and drops it. For the clean and jerk the athlete eventually brings the barbell loaded with plates from the floor to overhead and drops it as well What is the work done by the athlete on the barbell during each of these movements? Use g-9.8 m/s2 in your calculations. Wdeadlift w-clean and jerk=

Explanation / Answer

W = m g h

for deadlift, h' = (k - w) - L/2

h' = 1.07 - 0.6 - 0.54/2 = 0.2 m

W_deadlift = (315 x 0.454) (9.81)(0.2)

= 280.6 J ........Ans

for clean and jerk, h' = H - L/2 = 2 m

W clean and jerk = (126 x 0.454) (9.81)(2)

= 1122 J ......Ans

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