Answer: The bunchberry flower has the fastest-moving parts
Chapter 12, Problem 12.132(choose chapter or problem)
The bunchberry flower has the fastest-moving parts ever observed in a plant. Initially, the stamens are held by the petals in a bent position, storing elastic energy like a coiled spring. When the petals release, the tips of the stamen act like medieval catapults, flipping through a 60 angle in just 0.30 ms to launch pollen from anther sacs at their ends. The human eye just sees a burst of pollen; only high-speed photography reveals the details. As FIGURE CP12.85 shows, we can model the stamen tip as a 1.0@mm@long, 10 mg rigid rod with a 10 mg anther sac at the end. Although oversimplifying, well assume a constant angular acceleration. a. How large is the straightening torque? b. What is the speed of the anther sac as it releases its pollen?
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