Chapter 3: Q16. (page 67)
At what point in its path does a projectile have the least speed?
A projectile has the least speed at the top of its path.
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A long jumper leaves the ground atabove the horizontal plane and lands 8.0 m away. What is her ‘takeoff’ speed? (b) Now she is out on a kike and comes to the left bank of the river. There is no bridge, and the right bank is 10.0 m away horizontally and 2.5 m below vertically. If she long jumps from the edge of the left bank atwith the speed calculated, (a) how long or short of the opposite bank will she land?
A person, sitting in an enclosed train car moving at a constant velocity, throws a ball straight up into the air in her reference frame.(a) Where does the ball land?What is your answer if the car (b) accelerates, (c) decelerates, (d) rounds a curve, and (e) moves with constant velocity but is in the open air?
Two planes approach each other head-on. Each has a speed of 780 km/h, and they spot each other when they are initially 10.0 km apart. In how much time do the pilots have to take evasive action?
A hunter aims directly at a target (on the same level) 38.0 m away. (a) If the arrow leaves the bow at a speed of 23.1 m/s, by how much will it miss the target? (b) At what angle should the bow be aimed so the target will be hit?
A passenger on a boat moving at 1.70 m/s on a still lake walks up a flight of stairs at a speed of 0.60 m/s (Fig. 3–43). The stairs are angled at 45°, pointing in the direction of motion as shown. What is the velocity of the passenger relative to the water?
FIGURE 3-43 Problem 42
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