A volleyball player spikes the ball. At the instant that she begins to extend her shoulder to bring her arm forward, her shoulder is in 225° of flexion. She contacts the ball 120 ms later with her shoulder in 160° of flexion and extending at 700°/s. 100 ms later, at the end of her follow-through, her shoulder stops extending at a flexion angle of 135°. What was the average angular acceleration at the shoulder: (i) before ball contact and… (ii) after ball contact?
A volleyball player spikes the ball. At the instant that she begins to extend her shoulder to bring her arm forward, her shoulder is in 225° of flexion. She contacts the ball 120 ms later with her shoulder in 160° of flexion and extending at 700°/s. 100 ms later, at the end of her follow-through, her shoulder stops extending at a flexion angle of 135°. What was the average angular acceleration at the shoulder: (i) before ball contact and… (ii) after ball contact?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A volleyball player spikes the ball. At the instant that she begins to extend her shoulder to bring her arm forward, her shoulder is in 225° of flexion. She contacts the ball 120 ms later with her shoulder in 160° of flexion and extending at 700°/s. 100 ms later, at the end of her follow-through, her shoulder stops extending at a flexion angle of 135°.
What was the average angular acceleration at the shoulder:
(i) before ball contact and…
(ii) after ball contact?
[Assume extending = negative and flexing = positive]
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