A man could lift 152.5 kg above his head.
a) The man 1.6m tall. Assume he lifted the mass to 1.8 m above his head.Estimate the minimum force that each of his arm acted on the barbell.
b) Explainbriefly whether a short weightlifter or a tall weightlifter has an advantage in this sport.
Physics 挑戰題
2008-04-04 2:58 am
回答 (1)
2008-04-04 5:13 am
✔ 最佳答案
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a)Gain in PE of the mass:(152.5)(10)(1.6+1.8)=5185J
The work done by his two arms is to overcome the gain in PE of the mass:
5185=(2F)(1.6+1.8)
F=762.5N//
b)A short weightlifer has an advantage.Since the gain in PE of the mass would be lesser for a short weightlifter
THe man needs to do less work to overcome it's PE increase
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