Motor neurons in mammals transmit signals from the brain to skeletal muscles at approximately 25 m/s. Estimate how long in ms it takes a signal to get from your brain to your hand.
The time required for a signal to reach from the brain to the hand is .
The speed of signals from the brain to skeletal muscles is .
Suppose the distance between your brain and your hand is .
The average speed is given by .
Substitute the known values.
Therefore, the time required for a signal to reach from the brain to the hand is .
a. Write a paragraph describing the particle model. What is it,
and why is it important?
b. Give two examples of situations, different from those
described in the text, for which the particle model is appropriate.
c. Give an example of a situation, different from those described in the text, for which it would be inappropriate.
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