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Chapter 4: Q13Q (page 83)
(a) Is it possible to be accelerating while traveling at constant speed? Is it possible to round a curve with (b) zero acceleration and (c) a constant magnitude of acceleration?
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A football player punts the football so that it will have a “hang time” (time of flight) of and land away. If the ball leaves the player’s foot 150cm above the ground, what must be the (a) magnitude and (b) angle (relative to the horizontal) of the ball’s initial velocity?
You throw a ball toward a wall at speedand at angleabove the horizontal (Fig. 4-35). The wall is distancefrom the release point of the ball. (a)How far above the release point does the ball hit the wall? What are the (b)horizontal and (d) vertical components of its velocity as it hits the wall? (e)When it hits, has it passed the highest point on its trajectory?
A dart is thrown horizontally with an initial speed oftoward point, the bull’s-eye on a dart board. It hits at pointon the rim, vertically below later. (a)What is the distance? (b) How far away from the dart board is the dart released?
In , a balloon drifts north, east, and upward from its release point on the ground. Find (a) the magnitude of its average velocity. (b) the angle its average velocity makes with the horizontal.
Curtain of death.A large metallic asteroid strikes Earth and quickly digs a crater into the rocky material below ground level by launching rocks upward and outward. The following table gives five pairs of launch speeds and angles (from the horizontal) for such rocks, based on a model of crater formation. (Other rocks, with intermediate speeds and angles, are also launched.) Suppose that you are at x=20 kmwhen the asteroid strikes the ground at time t=0nd position x=0(Fig. 4-52). (a) At t=20 s, what are the xand y coordinates of the rocks headed in your direction from launches A through E? (b) Plot these coordinates and then sketch a curve through the points to include rocks with intermediate launch speeds and angles.The curve should indicate what you would see as you look up into the approaching rocks.
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