Unformatted text preview: ial speeds and angles. The projectiles do not land on the same terrain, however. Rank the situations according to the final speeds of the projectiles just before they land, greatest first. 4.4. At a certain instant, a fly ball has velocity 4r
v = 25i ˆ− 4.9 j (the x axis is horizontal, the y axis is upward, and is in meters per second). Has the ball passed the highest point of its trajectory? 4.7. In Fig. 425, a cream tangerine is thrown up past 4.7.
windows 1, 2, and 3, which are identical in size and regularly spaced vertically. Rank those three windows according to (a) the time the cream tangerine takes to pass them and (b) the average speed of the cream tangerine during the passage, greatest first. The cream tangerine then moves down past windows 4, 5, and 6, which are identical in size and irregularly spaced horizontally. Rank those three windows according to (c) the time the cream tangerine takes to pass them and (d) the average speed of the cream tangerine during the passage, greatest first. 4.8. An airplane flying horizontally at a constant 4.8.
speed of 350 km/h over level ground releases a bundle of food supplies. Ignore the effect of air on the bundle. What are the bundle’s initial (a) vertical and (b) horizontal components of velocity? (c) What is its horizontal component of velocity just before hitting the ground? (d) If the airplane’s speed were, instead, 450 km/h, would the time of the fall be large, smaller, or the same? 4.10. Figure 427 shows three paths for a football kicked 4.10.
from the ground level. Ignoring the effects of air on the flight, rank the paths according to (a) time of flight, (b) initial vertical velocity component, (c) initial horizontal velocity component, and (d) initial speed, greatest first. 4.12. Figure 429 shows 4.12.
four tracks (either half or quartercircles) that can be taken by a train, which moves at constant speed. Rank the tracks according to the magnitude of the train’s acceleration on the curved portion, greatest first. 4.13. (a) Is it possible to be accelerating 4.13.
while traveling at constant speed? Is it possible to round a curve with (b) zero acceleration and (c) a constant magnitude of acceleration? HRW Answers
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- Winter '14
- Acceleration, Velocity