90. An ambulance driver is rushing a patient to the hospital. While traveling at 72 km/h, she notices the traffic light at the upcoming intersections has turned amber T reach the intersection before the light turns red, she muct travel 50 m in 2.0 s. (a) What minimum acceleration must the ambulance have to reach the intersection before the light turns red? (b) What is the speed of the ambulance. when it reaches the intersection?

90. An ambulance driver is rushing a patient to the hospital. While traveling at 72 km/h, she notices the traffic light at the upcoming intersections has turned amber T reach the intersection before the light turns red, she muct travel 50 m in 2.0 s. (a) What minimum acceleration must the ambulance have to reach the intersection before the light turns red? (b) What is the speed of the ambulance. when it reaches the intersection?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter4: Motion In Two And Three Dimensions

Section: Chapter Questions

Problem 82AP: A race car entering the curved part of the track at the Daytona 500 drops its speed from 85.0 m/s to...

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A race car entering the curved part of the track at the Daytona 500 drops its speed from 85.0 m/s to 80.0 m/ s in 2.0 s. If the radius of the curved part of the track is 316.0 m, calculate the total acceleration of the race car at the beginning and ending of reduction of speed.
A care package is dropped out of a cargo plane and lands in the forest. If we assume the care package speed on impact is 54 m/s (123 mph), then what is its acceleration? Assume the trees and snow stops it over a distance of 3.0 m.
Michael, the regional manager of a mid-sized paper company innortheastern Pennsylvania, must drive to The Office every day for work.During his morning commute, he drives an average of 25 mph due East for15 minutes to exit his neighborhood, then turns 45o N of E onto I-81, wherehe drives at 70 mph for 5 more minutes. Finally, he exits I-81 and drives at30 mph at 45oS of E for 5 minutes before pulling into Scranton BusinessPark at 1725 Slough Avenue.a. What is his total distance traveled?b. What is his average speed?c. What is his displacement from home when he arrives at work?d. What is his average velocity?
A driver is traveling 18.0 m/s when she sees a red light ahead. Her car is capable of decelerating at a rate of 3.65m / (s ^ 2) If it takes her 0.380 s to get the brakes on and she is 24.0 m from the intersection when she sees the light, will she be able to stop in time? How far from the beginning of the intersection will she be, and in which direction?
My pug/bulldog mix, Georgia, who is blind and deaf, gets a whiff of her dinner. As soon as it registers to her that it's dinnertime, she accelerates from rest 2 ft/s2 towards the kitchen. If it took her 2.65 seconds to get to the kitchen, what was her final speed in ft/s2 when she got to her dinner bowl?
A student is running at her top speed of5.0 m/s to catch a bus, which is stopped at the bus stop. When the studentis still 40.0 m from the bus, it starts to pull away, moving with aconstant acceleration of 0.170 m/s2. For how much time and what distance does the student have to run at 5.0 m/s before she overtakes the bus?
My pug/bulldog mix, Georgia, who is blind and deaf, gets a whiff of her dinner. As soon as it registers to her that it's dinnertime, she runs 4.12 meters from the middle of our living room to our kitchen, where she is satiated with her grub. If it takes her 4.45 s to get to the kitchen, what was her speed in m/s to the nearest hundredth?
John is driving his sports car down a four-lane highway at 40 m/s. He overtakes a slow-moving truck. If he can accelerate at 5 m/s², how long will it take for him to reach the speed of 60 m/s?
2. Wellington Wildcat is rushing to get to a parade in time to be the grand marshal. He’s standing in theback of a flatbed truck while McFogg the Dog races at 25 m/s towards town. Suddenly, McFogg sees atiny maple leaf in the road 55 m ahead, and, being a proud Canadian, slams on the brakes to protect thesacred totem. Since McFogg is known to ride the brakes like a real jerk, let’s assume his reaction time tohit the breaks is essentially zero.A. Can McFogg actually stop before the truck reaches the leaf? The coefficients of friction betweenrubber tires and dry concrete are: μs = 1.00, μk = 0.80. When answering this question, be sure toinclude a free-body diagram representing the truck and its stellar mascots as a single object.B. Now here’s the real serious question: Is it possible for McFogg to stop short of the leaf such thatWellington does not slip and slide into the back of the truck cab? The coefficients of friction forWellington’s shoes on the bed of the truck are: μs = 0.60, μk…
A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slop , it’s speed is 4m/s. But 3 seconds later,at the bottom of the slope,it’s speed is 22m/s. What is the average acceleration?
2. An airplane travels 280 m down the runway before taking off. If it starts from rest, moves withconstant acceleration, and becomes airborne in 8.00 s, what is its speed, in m/s, when it takesoff?
The driver of a car is initially moving at a constant speed of 70.4 km/h when a traffic light turns red. If a 0.520 s reaction time is required before the brakes can be applied, what is the distance in meters traveled by the car before it begins to slow down?