**72. A 6.8-kg bowling ball is attached to the end of a nylon cord with across-sectional area of 3.4 × 10-$ m². The other end of the cord is fixedto the ceiling. When the bowling ball is pulled to one side and releasedfrom rest, it swings downward in a circular arc. At the instant it reachesits lowest point, the bowling ball is 1.4 m lower than the point from whichit was released, and the cord is stretched 2.7 × 10-³ m from its unstrainedlength. What is the unstrained length of the cord? (Hint: When calculat-ing any quantity other than the strain, ignore the increase in the lengthof the cord.)

Let the mass of the ball be m, the cross-sectional area of the chord be A, the change in the length…

Answered: **72. A 6.8-kg bowling ball is attached…

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