Concept explainers
You are 9.0 m from the door of your bus, behind the bus, when it pulls away with an acceleration of 1.0 m/s2. You instantly start running toward thestill-open door at 4.5m/s.
a. How long does it take for you to reach the open door and jump in?
b. What is the maximum time you can wait before starting to run and still catch the bus?
Learn your wayIncludes step-by-step video
Chapter 2 Solutions
Physics for Scientists and Engineers: A Strategic Approach with Modern Physics, Books a la Carte Edition; Student Workbook for Physics for Scientists ... eText -- ValuePack Access Card (4th Edition)
Additional Science Textbook Solutions
Microbiology: An Introduction
Human Anatomy & Physiology (2nd Edition)
Cosmic Perspective Fundamentals
Campbell Essential Biology (7th Edition)
Campbell Biology: Concepts & Connections (9th Edition)
Biology: Life on Earth (11th Edition)
- 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/s to take off and it accelerates from rest at an average rate of 0.35m/s2 , how far will it travel before becoming airborne? (b) How long does this take?arrow_forwardA ball starts from rest and accelerates at 0.500 m/s2 while moving down an inclined plane 9.00 m long. When it reaches the bottom, the ball rolls up another plane, where it comes to rest after moving 15.0 m on that plane. (a) What is the speed of the ball at the bottom of the first plane? (b) During what time interval does the ball roll down the first plane? (c) What is the acceleration along the second plane? (d) What is the balls speed 8.00 m along the second plane?arrow_forward(a) A light-rail commuter train accelerates at a rate of 1.35m/s2 . How long does it take to reach its top speed of 80.0 km/h, starting from rest? (b) The same train ordinarily decelerates at a rate of 1.65m/s2 . How long does it take to came to a stop from its top speed? (c) In emergencies, the train can decelerate more rapidly, coming to rest from 80.0 km/h in 8.30 s. What is its emergency acceleration in meters per second sqquared?arrow_forward
- An object is at x = 0 at t = 0 and moves along the x axis according to the velocitytime graph in Figure P2.40. (a) What is the objects acceleration between 0 and 4.0 s? (b) What is the objects acceleration between 4.0 s and 9.0 s? (c) What is the objects acceleration between 13.0 s and 18.0 s? (d) At what time(s) is the object moving with the lowest speed? (e) At what time is the object farthest from x = 0? (f) What is the final position x of the object at t = 18.0 s? (g) Through what total distance has the object moved between t = 0 and t = 18.0 s? Figure P2.40arrow_forwardA driver uniformly accelerates his car such that a=6.851im/s2. a. Assuming he starts from rest, find the velocity of the car after it has accelerated for 4.55 s. b. If immediately after that 4.55 s the driver lays off the accelerator, slams on the brakes, and comes to a stop in the subsequent 5.62 s, what is the acceleration he experiences during that time, assuming the acceleration is constant?arrow_forwardAn express train passes through a station. It enters with an initial velocity of 22.0 m/s and decelerates at a rate of 0.150m/s2 as it goes through. The station in 210.0 m long. (a) How fast is it going when the nose leaves the station? (b) How long is the nose of the train in the station? (c) If the train is 130 m long, what is the velocity of the end of the train as it leaves? (d) When does the end of the train leave the station?arrow_forward
- A cyclist rides 8.0 km east for 20 minutes, then he turns and heads west for 8 minutes and 3.2 km. Finally, he rides east for 16 km, which takes 40 minutes. (a) What is the final displacement of the cyclist? (b) What is his average velocity?arrow_forwardThe nearest convenience store is 60 m, east from your house. You are walking 1.2 m/s for 15.0 s towards the store when it started raining so you have to ran back to your house to get an umbrella. It took you 5.0 s to go back to your house. You started walking again at 1.2 m/s until you reach the grocery. a. What is your average speed? b. Calculate the average velocity.arrow_forwardB. A heavy rock is thrown straight up with a velocity of 160 ft/ sec. The rock reaches a height of S= 160t - 16t2 ft after t sec. Find: i. How high does the rock go? ii. What are the velocity of the rock when it is 256 ft above the ground on the way up? iii. What is the acceleration of the rock at any time t? iv. When does the rock hit the ground again?arrow_forward
- U 08. A cyclist is travelling at a constant speed of 12 m s' when he passes a stationary bus. The bus starts moving just as the cyclist passes, and accelerates at 1.5 ms wus a When does the bus reach the same speed as the cyclist? b How long does the bus take to catch the cyclist? c What distance has thearrow_forwardA train starts from rest and accelerates uniformly, until it has traveled 3.3 km and acquired a velocity of 48 m/s. The train then moves at a constant velocity of 48 m/s for 430 s. The train then decelerates uniformly at 0.065 m/s?, until it stops. a. What is the acceleration during the first 3.3 km of travel? b. How far in kilometers does the train travel during the period of deceleration? c. What is the duration of time required for the train to decelerate?arrow_forwardAn egg is thrown nearly vertically upward from a point near the cornice of a tall building. It just misses the cornice on the way down and passes a point a distance 50.0 m below its starting point at a time 5.00 s after it leaves the thrower's hand. Air resistance may be ignored. a. What is the initial speed of the egg, and how high does it rise above its starting point? b. What is the magnitude of its velocity at the highest point? c.arrow_forward
- University Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice UniversityPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning