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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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A ball is thrown down vertically with an initial speed of from a height of . (a) What is its speed just before it strikes the ground? (b) How long does the ball take to reach the ground? What would be the answers to (c) part a and (d) part b if the ball were thrown upward from the same height and with the same initial speed? Before solving any equations, decide whether the answers to (c) and (d) should be greater than, less than, or the same as in (a) and (b).
At, a particle moving along an x axis is at position. The signs of particle鈥檚 initial velocity(at time) and constant acceleration a are, respectively, for four situationsIn which situations will the particle (a) stop momentarily, (b) pass through the origin, and (c) never pass through the origin?
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.
In figure, a red car and a green car, identical except for the color, move toward each other in adjacent lanes and parallel to x axis. At time t=0, the red car is atand green car is at . If the red car has constant velocity of 20 km/hr, the cars pass each other atx = 44.5 m, and if it has a constant velocity of40 km/hr, they pass each other atx = 76.6 m. What are (a) the initial velocity? (b) the constant acceleration of the green car?
Figure 2-19 is a graph of a particle鈥檚 position along an x axis versus time. (a) At time, what is the sign of the particle鈥檚 position? Is the particle鈥檚 velocity positive, negative, or 0 at (b), (c), and (d)? (e) How many times does the particle go through the point?
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