The Bunchberry flower nas 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. We can model the stamen tip as a 1.0 mm long, 10µg rigid rod with a 10µg anther sac at the end. Although oversimplifying, we'll assume a constant angular acceleration. A. How large is the "straightening torque"? (you Pollen Pollen Anther sac 10 mm 60 may assume the torques created by the gravity Stamen force are minimal compared to the straightening torque, and can be ignored. B. What is the speed of the anther sac as it releases its pollen? Initial configuration Final configuration
The Bunchberry flower nas 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. We can model the stamen tip as a 1.0 mm long, 10µg rigid rod with a 10µg anther sac at the end. Although oversimplifying, we'll assume a constant angular acceleration. A. How large is the "straightening torque"? (you Pollen Pollen Anther sac 10 mm 60 may assume the torques created by the gravity Stamen force are minimal compared to the straightening torque, and can be ignored. B. What is the speed of the anther sac as it releases its pollen? Initial configuration Final configuration
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Transcribed Image Text: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. We can model the stamen tip as a
1.0 mm long, 10µg rigid rod with a 10µg anther sac
at the end. Although oversimplifying, we'll assume a
Pollen
Pollen
Anther sac
constant angular acceleration.
A. How large is the "straightening torque"? (you
may assume the torques created by the gravity
1.0 mm
Stamen
force
are
minimal
compared
to
the
straightening torque, and can be ignored.
B. What is the speed of the anther sac as it releases its pollen?
Initial configuration
Final configuration
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