College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Chapter 2, Problem 12PE
The speed of propagation of the action potential (an electrical signal) in a nerve cell depends (inversely) on the diameter of the axon (nerve fiber). If the nerve cell connecting the spinal cord to your feet is 1.1 m long, and the nerve impulse speed is 18 m/s, how long does it take for the nerve signal to travel this distance?
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The speed of propagation of the action potential (an electric signal) in a nerve cell depends (inversely) on the diameter of the axon(nerve fiber). If the nerve cell connecting the spinal cord to your feet is 0.9 m long and the nerve impulse is 16 m/s. How long (in s) does it take for the nerve signal to travel this distance ?
After conducting the signal speed experiment
a student has recorded the following data.
L₂ (m)
1.5
3
4.5
8
15
30
dt (ns)
6.50
13.72
21.02
38.10
72.20
145.42
L2 is the length of the longer cable in meters
and dt is the measured time delay in
nanoseconds. The student neglected to
record L₁, the length of the shorter cable.
After speaking with their instructor, they learn
all is not lost. They know the speed of the
signal can be calculated based on the distance
traveled divided by the time. However, the
recorded times measure how much longer the
signal had to travel in L2 compared to L₁. A
little bit of thought convinces them (correctly)
that
The distance from the Earth to the moon is 239,000 miles. The distance from the Earth to the moon is 385000 km. Given that light travels at 3.00 × 10⁸ m/s how many minutes does it take for light to travel to the moon?
Chapter 2 Solutions
College Physics
Ch. 2 - Give an example in which there are clear...Ch. 2 - Under what circumstances does distance traveled...Ch. 2 - Bacteria move back and f01th by using their...Ch. 2 - A student writes, "A bird that is diving for prey...Ch. 2 - What is the speed of the bird in Exercise 2.4?Ch. 2 - Acceleration is the change in velocity over time....Ch. 2 - A weather forecast states that the temperature is...Ch. 2 - Give an example (but not one from the text) of a...Ch. 2 - There is a distinction between average speed and...Ch. 2 - Does a car's odometer measure position or...
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