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1.34 A motorist is traveling at 54 km/h when she observes that a traffic light 240 m ahead of her turns red. The traffic light is timed to stay red for 24 s. If the motorist wishes to pass the light without stopping just as it turns green again, determine (a) the required uniform decel- eration of the car, (b) the speed of the car as it passes the light. 54 km/h

1.34 A motorist is traveling at 54 km/h when she observes that a traffic light 240 m ahead of her turns red. The traffic light is timed to stay red for 24 s. If the motorist wishes to pass the light without stopping just as it turns green again, determine (a) the required uniform decel- eration of the car, (b) the speed of the car as it passes the light. 54 km/h

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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11.34
11.33 An airplane begins its take-off run at A with zero velocity and constant acceleration a. Knowing that it becomes airborne 30 s late at B and that the distance AB is 900 m, determine (a) the acceleration (b) the take-off velocity VB. Fig. P11.33 11.34 A motorist is traveling at 54 km/h when she observes that a traffic light 240 m ahead of her turns red. The traffic light is timed to stay red for 24 s. If the motorist wishes to pass the light without stopping just as it turns green again, determine (a) the required uniform decel- eration of the car, (b) the speed of the car as it passes the light. 54 km/h Fig. P11.34 L B 22 240 m RAIL LINES 11.35 Steep safety ramps are built beside mountain highways to enable vehicles with defective brakes to stop safely. A truck enters a 750-ft ramp at a high speed vo and travels 540 ft in 6 s at constant decelera- tion before its speed is reduced to vo/2. Assuming the same constant deceleration, determine (a) the additional time required for the truck to stop (b) the additional distance traveled by the truck.
Transcribed Image Text:11.33 An airplane begins its take-off run at A with zero velocity and constant acceleration a. Knowing that it becomes airborne 30 s late at B and that the distance AB is 900 m, determine (a) the acceleration (b) the take-off velocity VB. Fig. P11.33 11.34 A motorist is traveling at 54 km/h when she observes that a traffic light 240 m ahead of her turns red. The traffic light is timed to stay red for 24 s. If the motorist wishes to pass the light without stopping just as it turns green again, determine (a) the required uniform decel- eration of the car, (b) the speed of the car as it passes the light. 54 km/h Fig. P11.34 L B 22 240 m RAIL LINES 11.35 Steep safety ramps are built beside mountain highways to enable vehicles with defective brakes to stop safely. A truck enters a 750-ft ramp at a high speed vo and travels 540 ft in 6 s at constant decelera- tion before its speed is reduced to vo/2. Assuming the same constant deceleration, determine (a) the additional time required for the truck to stop (b) the additional distance traveled by the truck.
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