An athlete shown in the picture below perfarms variaus physical exercises. The p
ID: 1789272 • Letter: A
Question
An athlete shown in the picture below perfarms variaus physical exercises. The parameters of the athlete are as follaws. The height from the floor to the palm af the hands raised averhead is H-2.275m, the length of the tarso 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=1.075m. The diameter of the plate on the barbell is L=0.55m. The athlete performs two movements: 542.5lb squat and 155lb clean and lerk. For the squat the bar is resting on the shoulders. The athlete starts in the bottom ofthe squat with hips level with the knees, and then stands right up. For the clean and Jerk the nthlete eventually brings the barbell Icaded with plates fr Dm lhe flacr to lhe Gverhead mn:1rcps it from the lop. Whahe work done hy the athlete on the barhell during each of these movements? se g-9.8 m/s2 in your calculations. Far the up and down motion(s) add up the atsolute values of mechanical work Wssuet- 1931 Wcican and k13793 r squat took 3.4s and clean and jerk took the same 3.4s to complete, which movement is more powerful? OClean and jerk because it is much lighter so it maves faster squat because its range of motion is shorter The same for both because work and time to execute are the same Squil bet ause it's mare work in the same lueriod of time squat because it's neavier Clean and jerk because its range of motion is largerExplanation / Answer
given H = 2.275 m
h = 0.8 m
w = 0.6 m
k = 1.075 m
L = 0.55 m
a. Wsquat
m = 542.5 lb = 246.07386 kg
work done = mg*w = 246.07386*9.81*0.6 = 1448.39073996 J
WWclean and jerk
m = 155 lb = 70.3068 kg
work done = mg(H - L/2) = 70.3068*9.81*(2.275 - 0.55/2) = 1379.419416 J
b. as time consumed in both the motions is the same, power consumed in squat is more than the power consumed in clean and jerk