During one stage of a discus throw the thrower\'s arm moves throughan angle of 7

Question

During one stage of a discus throw the thrower's arm moves throughan angle of 750 in a period of .13 s. If the distancefrom the thrower's shoulder to the discus is 87 cm, calculate thelinear velocity of the discus relative to the shoulder during thistime interval.

Explanation / Answer

First take the radius and find the circumference of the circle madeby the arm=> .87m*2*Pi=5.46637 Multiply this circumference by percentage of the circle traveled bythe arm to find the linear distance traveled by the discus: 5.46637*(75/360)=1.13883m So if the distance was traveled in .13 seconds, simply divide thedistance by the time to find the linear velocity: 1.13883/.13=8.76m/s

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