12.
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? Round your answer to three decimal places.
25.
At the end of a race, a runner decelerates from a velocity of 9.00 m/s at a rate of 2.00 m/s2. (a) How far does she travel in the next 5.00 s? Round your answer to one decimal place.
25.
At the end of a race, a runner decelerates from a velocity of 9.00 m/s at a rate of 2.00 m/s2. (b) What is her final velocity after 5.00 s? Round your answer to three decimal places.
45.
A dolphin in an aquatic show jumps straight up out of the water at a velocity of 13.0 m/s. (a) After how much time does he come to a stop before falling back down? Round to two decimal places.
45.
A dolphin in an aquatic show jumps straight up out of the water at a velocity of 13.0 m/s. (b) How high does his body rise above the water? Round to two decimal places.