In softball, the pitcher throws with the arm fully extended (straight at the elbow). In a fast pitch the ball leaves the hand with a speed of 139 km/h.(a) Find the rotational kinetic energy of the pitcher’s arm given its moment of inertia is 0.720 kg ⋅ m2 and the ball leaves the hand at a distance of 0.600 m from the pivot at the shoulder.(b) What force did the muscles exert to cause the arm to rotate if their effective perpendicular lever arm is 4.00 cm and the ball is 0.156 kg?

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College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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In softball, the pitcher throws with the arm fully extended (straight at the elbow). In a fast pitch the ball leaves the hand with a speed of 139 km/h.

(a) Find the rotational kinetic energy of the pitcher’s arm given its moment of inertia is 0.720 kg ⋅ m² and the ball leaves the hand at a distance of 0.600 m from the pivot at the shoulder.

(b) What force did the muscles exert to cause the arm to rotate if their effective perpendicular lever arm is 4.00 cm and the ball is 0.156 kg?

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