Which of the following statements is incorrect? O The sum of two or more vectors is represented by a resultant vector, O Average velocity is the rate at which an object changes its position from one place to another. O Acceleration is a rate of change of velocity. O At constant velocity, the object is moving in a straight line with zero acceleration. O At constant velocity, the object is moving in a straight line at a varying speed.

Which of the following statements is incorrect? O The sum of two or more vectors is represented by a resultant vector, O Average velocity is the rate at which an object changes its position from one place to another. O Acceleration is a rate of change of velocity. O At constant velocity, the object is moving in a straight line with zero acceleration. O At constant velocity, the object is moving in a straight line at a varying speed.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter4: Two-and-three Dimensional Motion

Section: Chapter Questions

Problem 11PQ

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Cars A and B each move to the right with constant acceleration along a straight road. The velocity vectors of each car are shown in Figure P2.78 for several times separated by equal time intervals. For the entire interval from time t1 to time t4, car B is ahead of car A (that is, car B is to the right of car A), a. Is the acceleration of car B to the left, to the right, or zero? Explain. b. Is the magnitude of the acceleration of car A greater than, less than, or equal to the magnitude of the acceleration of car B? Explain your reasoning, c. Is the distance between car A and car B at time t3 greater than, less than, or equal to the distance between car A and car B at time t2? Explain.
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While strolling downtown on a Saturday Afternoon, you stumble across an old car show. As you are walking along an alley toward a main street, you glimpse a particularly stylish Alpha Romeo pass by. Tall buildings on either side of the alley obscure your view, so you see the car only as it passes between the buildings. Thinking back to your physics class, you realize that you can calculate the cars acceleration. You estimate the width of the alleyway between the two buildings to be 4 m. The car was in view for 0.5 s. You also heard the engine rev when the car started from a red light, so you know the Alpha Romeo started from rest 2 s before you first saw it. Find the magnitude of its acceleration.
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For projectile motion without air resistance, which of the following statements is true about the x- and y- components of acceleration? O They are both constant, where the x-component is a positive number and the y-component is the local acceleration due to gravity. none of the given choices O They both change as a function of position along the parabolic path. They are both constant, where the x-component is zero and the y-component is the local acceleration due to gravity. O They both change, but there is insufficient information given.
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