17. You are bicycling along a straight north-south road. Let the x-axis point north. Describe your motion in each of the following cases. Example: a, > 0 and Vz > 0 means you are moving north and speeding up. (a) a, > 0 and V, < 0. (b) a, = 0 and v, < 0. (c) a, < 0 and v, (d) a,<0 and V, < 0. (e) Based on your answers, explain why it is not a good idea to use the expression “negative acceleration" to mean slowing down. %3D %3D X. 99

17. You are bicycling along a straight north-south road. Let the x-axis point north. Describe your motion in each of the following cases. Example: a, > 0 and Vz > 0 means you are moving north and speeding up. (a) a, > 0 and V, < 0. (b) a, = 0 and v, < 0. (c) a, < 0 and v, (d) a,<0 and V, < 0. (e) Based on your answers, explain why it is not a good idea to use the expression “negative acceleration" to mean slowing down. %3D %3D X. 99

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter4: Motion In Two Dimensions

Section: Chapter Questions

Problem 4.71AP: A hawk is flying horizontally at 10.0 m/s in a straight line, 200 m above the ground. A mouse it has...

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Does a car moving around a circular track with constant speed have (a) zero acceleration, (b) an acceleration in the direction of its velocity, (c) an acceleration directed away from the center of its path, (d) an acceleration directed toward the center of its path, or (e) an acceleration with a direction that cannot be determined from the given information?
A hawk is flying horizontally at 10.0 m/s in a straight line, 200 m above the ground. A mouse it has been carrying struggles free its talons. The hawk continues on its path at the same speed for 2.00 s before attempting to retrieve its prey. To accomplish the retrieval, it drives in a straight line- at constant speed and recaptures the mouse 3.00 m above the ground. (a) Assuming no air resistance acts on the mouse, find the driving speed of the hawk. (b) What angle did the hank make with the horizontal during its descent? (c) For what time interval did the mouse experience free fall?
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