1 The speed of a nerve impulse in the human body is about 100 m/s. If you accide
ID: 2169095 • Letter: 1
Question
1 The speed of a nerve impulse in the human body is about 100 m/s. If you accidentally stub you toe in the dark, estimate the time it takes the nerve impulse to travel to your brain. (Assume that you are approximately 2.0 m tall and that the nerve impulse travels at uniform speed.)2:A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 30.0 min at 60.0 km/h, 6.0 min at 90.0 km/h and 40.0 min at 60.0 km/h, and spends 50.0 min eating lunch and buying gas.
(a) Determine the average speed for the trip.
km/h
(b) Determine the distance between the initial and final cities along this route.
km
3:A motorist drives north for 36.0 minutes at 86.5 km/h and then stops for 15.0 minutes. He then continues north, traveling 130 km in 2.30 h.
(a) What is his total displacement?
km
(b) What is his average velocity?
km/h
4: A tennis player moves in a straight-line path as shown in the graph below. The vertical divisions represent 1.0 m and the horizontal divisions represent 1.0 s. Find her average velocity in the following time intervals.
(a) 0 to 1.0 s
m/s
(b) 0 to 4.0 s
m/s
(c) 1.0 s to 5.0 s
m/s
(d) 0 to 5.0 s
m/sA
5:tennis player moves in a straight-line path as shown in the graph below. The vertical divisions of the figure below represent 5.0 m and the horizontal divisions represent 1.0 s. Find the instantaneous velocities of the tennis player at the following times:
(a) t = 0.50 s m/s
(b) t = 2.0 s m/s
(c) t = 3.0 s m/s
(d) t = 4.5 s m/s
6:Runner A is initially 10.0 mi west of a flagpole and is running with a constant velocity of 7.0 mi/h due east. Runner B is initially 6.0 mi east of the flagpole and is running with a constant velocity of 4.0 mi/h due west. How far are the runners from the flagpole when they meet?
7:
A certain car is capable of accelerating at a rate of +0.80 m/s2. How long does it take for this car to go from a speed of 20 mi/h to a speed of 60
Explanation / Answer
In fact, distance traveled = speed of travel * time it takes. Thus, time = distance/speed ==> time = 2m/(100m/s) ==> time ~ 0.02 seconds.
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