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18 May 2018
5.67 - CP BIO Forces During Chin-ups. When you do a chin-up, you raise your chin just over a bar (the chinning bar), sup- porting yourself with only your arms. Typically, the body below the arms is raised by about 30 cm in a time of 1.0 S, starting from rest. Assume that the entire body of a 680-N person doing chin- ups is raised by 30 cm, and that half the 1.0 s is spent accelerating upward and the other half accelerating downward, uniformly in both cases. Draw a free-body diagram of the person's body, and use it to find the force his arms must exert on him during the accelerating part of the chin-up.
5.67 - CP BIO Forces During Chin-ups. When you do a chin-up, you raise your chin just over a bar (the chinning bar), sup- porting yourself with only your arms. Typically, the body below the arms is raised by about 30 cm in a time of 1.0 S, starting from rest. Assume that the entire body of a 680-N person doing chin- ups is raised by 30 cm, and that half the 1.0 s is spent accelerating upward and the other half accelerating downward, uniformly in both cases. Draw a free-body diagram of the person's body, and use it to find the force his arms must exert on him during the accelerating part of the chin-up.
Deanna HettingerLv2
20 May 2018
