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Chapter 4: Q106P (page 91)
The position vector for a proton is initially and then later isrole="math" localid="1657003791208" all in meters. (a) What is the proton’s displacement vector, and (b) to what plane is that vector parallel?
(a) The proton’s displacement vector is
(b) is parallel to the X-Y plane
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A positron undergoes a displacement, ending with the position vector localid="1654329593013" , in meters. What was the positron’s initial position vector?
A baseball is hit at ground level. The ball reaches its maximum height above ground level 3.0 safter being hit. Then 2.5 s after reaching its maximum height, the ball barely clears a fence that is 97.5 mfrom where it was hit. Assume the ground is level. (a) What maximum height above ground level is reached by the ball? (b) How high is the fence? (c) How far beyond the fence does the ball strike the ground?
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 person walks up a stalled long escalator in.When standing on the same escalator, now moving, the person is carried up in. How much time would it take that person to walk up the moving escalator? Does the answer depend on the length of the escalator?
You are kidnapped by political-science majors (who are upset because you told them political science is not real science). Although blindfolded, you can tell the speed of their car (by the whine of the engine), the time of travel (by mentally counting off seconds), and the direction of travel (by turns along the rectangular street system). From these clues, you know that you are taken along the following course: for, turn to the right, for, turn to the right, for, turn to the left,for, turn to the right, for, turn to the left for. At that point, (a) how far are you from your starting point, and (b) in what direction relative to your initial direction of travel are you?
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