Problem Two cars are driving towards each other on a straight road with speeds voA = 72 km/h and VOB = 54 km/h. When the distance bewteen them is 150 m, their drivers push the brakes simultaneously and start decelerating uniformly to avoid a collision. Assuming that the two cars stop at a distance of 10 m from each other, and that car A stops 1.0s later than car B, determine a) the acceleration of each car; b) the braking distances for each car; c) the braking times for each car.

Problem Two cars are driving towards each other on a straight road with speeds voA = 72 km/h and VOB = 54 km/h. When the distance bewteen them is 150 m, their drivers push the brakes simultaneously and start decelerating uniformly to avoid a collision. Assuming that the two cars stop at a distance of 10 m from each other, and that car A stops 1.0s later than car B, determine a) the acceleration of each car; b) the braking distances for each car; c) the braking times for each car.

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 4.17P: Chinook salmon are able to move through water especially fast by jumping out of the water...

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Chinook salmon are able to move through water especially fast by jumping out of the water periodically. This behavior is called porpoising. Suppose a salmon swimming in still water jumps out of the water with velocity 6.26 m/s at 45.0 above the horizontal, sails through the air a distance L before returning to the water, and then swims the same distance L underwater in a straight, horizontal line with velocity 3.58 m/s before jumping out again. (a) Determine the average velocity of the fish for the entire process of jumping and swimming underwater. (b) Consider the time interval required to travel the entire distance of 2L. By what percentage is this time interval reduced by the jumping/swimming process compared with simply swimming underwater at 3.58 m/s?
A swan on a lake gets airborne by flapping its wings and running on top of the water. (a) If the swan must reach a velocity of 6.00 m/s2, to take off and it accelerates from rest at an average rate of 0.350 m/s2, how far will it travel before becoming airborne? (b) How long does this take?
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