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(c) Suppose the micro-muscle spans an ideal pin joint and it the muscle has the moment arm computed in part (b) when it is at its optimal length (

Mathinline
body--uriencoded--\ell_%7B\mathrm%7Bo%7D%7D%5e%7B\mathrm%7BM%7D%7D
). What is the joint displacement (
Mathinline
body\Delta \theta
) beyond which the micro-muscle will generate zero active force? Assume the muscle has the linear force–length relationship shown here:

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