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Chapter 9 - 9.53

53. To swim at constant velocity the swimmer must push back against the water with a force of 110 N.

Relative to him the water is going at 0 . 22 m / s toward his rear,in the same direction as his force. Using

Eq. 7-48,his power output is obtained:

P = F

v = Fv = (110 N)(0 . 22 m / s) = 24 W .