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Chapter 2: Q103P (page 39)
Question: If a baseball pitcher throws a fastball at a horizontal speed of 160 Km/hr,how long does the ball take to reach homeplate 18.4 maway?
The time taken by ball to reach home plate is .
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The position of a particle as it moves along a axis is given by , with in seconds and in centimeters. (a) What is the average velocity of the particle between and ? (b) What is the instantaneous velocity of the particle at ,, and ?? (c) What is the average acceleration of the particle between and ? (d) What is the instantaneous acceleration of the particle at ,, and ?
How far does the runner whose velocity time graph is shown in Fig 2-40 travel in?The figure鈥檚 vertical scaling is set by .
: Most important in an investigation of an airplane crash by the U.S. National Transportation Safety Board is the data stored on the airplane鈥檚 flight-data recorder, commonly called the 鈥渂lack box鈥� in spite of its orange coloring and reflective tape. The recorder is engineered to withstand a crash with an average deceleration of magnitude during a time interval of . In such a crash, if the recorder and airplane have zero speed at the end of that time interval, what is their speed at the beginning of the interval?
Figure 2-20 gives the velocity of a particle moving along an axis. Point 1 is at the highest point on the curve; point 4 is at the lowest point; and points 2 and 6 are at the same height. What is the direction of travel at (a) time and (b) point 4? (c) At which of the six numbered points does the particle reverse its direction of travel? (d) Rank the six points according to the magnitude of the acceleration, greatest first.
You are arguing over a cell phone while trailing an unmarked police car by ; both your car and the police car are traveling at .Your argument diverts your attention from the police car for , (long enough for you to look at the phone and yell, 鈥淚 won鈥檛 do that!鈥�). At the beginning of that ,the police officer begins braking suddenly at (a)What is the separation between the two cars when your attention finally returns? Suppose that you take another to realize your danger and begin braking. (b)If you too brake at,what is your speed when you hit the police car?
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