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.

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.

For your senior project, you would like to build a cyclotron that will accelerate protons to $10\%$of the speed of light. The largest vacuum chamber you can find is $50cm$ in diameter. What magnetic field strength will you need?

A speed skater accelerates from rest and then keeps skating at a constant speed. Draw a complete motion diagram of the skater

A baseball player starts running to the left to catch the ball as soon as the hit is made. Use the particle model to draw a motion diagram showing the position and average velocity vectors of the player during the first few seconds of the run.

For Problem 34, draw a complete pictorial representation. Do not solve these problems or do any mathematics. |

A Porsche accelerates from a stoplight at $5.0m/s^2$ for five seconds, then coasts for three more seconds. How far has it traveled?