College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- A car starts from rest, then accelerates at a constant rate over a distance of 89 m. It then immediately decelerates at a constant rate over a distance of 152 m. The entire trip lasts a total duration of 27.2 s. What were the magnitudes of the car s accelerations for the speedup and slowdown stages respectively? 1. 1.76 m/s^2, then 1.03 m/s^2 2. 3.27 m/s^2, then 5.59 m/s^2 3. 0.65 m/s^2, then 0.65 m/s^2 4. 5.59 m/s^2, then 3.27 m/s^2arrow_forwardA car accelerates in the +x direction from rest with a constant acceleration of a1 = 1.92 m/s2 for t1 = 20 s. At that point the driver notices a tree limb that has fallen on the road and brakes hard with a constant acceleration of a2 = -9.3 m/s2. If the limb is on the road at a distance of 550 meters from where the car begins its initial acceleration, will the car hit the limb?arrow_forwardThe position of a particle moving along the x axis is given by x(t) = 7t² - 1.7t³, where x is in meters and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction?arrow_forward
- A rocket-powered sled moves along a track, eventually reaching a top speed of 219 m/s to the east. It then begins to slow down, reaching a complete stop after slowing down for 4.98 s. What was the sled s average acceleration and velocity during the slowdown phase? 44.0 m/s^2 east, not enough information 109.5 m/s^2 west, 109.5 m/s west 44.0 m/s^2 west, not enough information 0 m/s^2 0, 109.5 m/s eastarrow_forwardTwo soccer players start from rest, 39 m apart. They run directly toward each other, both players accelerating. The first player's acceleration has a magnitude of 0.48 m/s². The second player's acceleration has a magnitude of 0.49 m/s². (a) How much time passes before the players collide? (b) At the instant they collide, how far has the first player run? (a) Number M. (b) Number i Units Units ✪arrow_forwardMature salmon swim upstream, returning to spawn at their birthplace. During the arduous trip they leap vertically upward over waterfalls as high as 3.31 m. With what minimum speed (in m/s) must a salmon launch itself into the air to clear a 3.31-m waterfall? in m/sarrow_forward
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