Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 1, Problem 6P
To determine
The reflex time for stimulus at the knee.
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External stimuli are communicated to the brain by means of electrical signals propagating along with nerve cells at a speed of approximately 30 m/s. Similarly, electrical messages are sent at the same speed from the brain along with nerve cells to the muscles. Reflex actions are controlled by a relatively simple nerve circuit from a muscle to the spine and back to the muscle. Estimate the reflex time for a stimulus at the knee. (Assume that the signal resulting from the stimulus must travel a distance Δs = 1 m.)
Kinesin is a motor protein that moves cargo within cells in a series of rapid 8-nm-long steps. Each step takes 50 μs, and there is an average 15 ms delay between steps. To one significant figure, what is the average speed of a Kinesin motor protein?
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Chapter 1 Solutions
Physics Fundamentals
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