The Physics of Everyday Phenomena
8th Edition
ISBN: 9780073513904
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 2, Problem 27CQ
Suppose the acceleration of a car increases with time. Could we use the relationship v = v0 + at in this situation? Explain.
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Chapter 2 Solutions
The Physics of Everyday Phenomena
Ch. 2 - Prob. 1CQCh. 2 - Suppose we choose inches as our basic unit of...Ch. 2 - What units would have an appropriate size for...Ch. 2 - A tortoise and a hare cover the same distance in a...Ch. 2 - A driver states that she was doing 80 when stopped...Ch. 2 - Does the speedometer on a car measure average...Ch. 2 - Is the average speed over several minutes more...Ch. 2 - The highway patrol sometimes uses radar guns to...Ch. 2 - Is the term vehicle density (as used in everyday...Ch. 2 - Prob. 10CQ
Ch. 2 - At the front end of a traffic jam, is the vehicle...Ch. 2 - A hockey puck is sliding on frictionless ice. It...Ch. 2 - A ball attached to a string is whirled in a...Ch. 2 - Prob. 14CQCh. 2 - A dropped ball gains speed as it falls. Can the...Ch. 2 - A driver of a car steps on the brakes, causing the...Ch. 2 - At a given instant in time, two cars are traveling...Ch. 2 - A car just starting up from a stop sign has zero...Ch. 2 - A car traveling with constant speed rounds a curve...Ch. 2 - A racing sports car traveling with a constant...Ch. 2 - In the graph shown here, velocity is plotted as a...Ch. 2 - A car moves along a straight line so that its...Ch. 2 - For the car whose distance is plotted against time...Ch. 2 - A car moves along a straight section of road so...Ch. 2 - For the car whose velocity is plotted in question...Ch. 2 - Look again at the velocity-versus-time graph for...Ch. 2 - Suppose the acceleration of a car increases with...Ch. 2 - When a car accelerates uniformly from rest, which...Ch. 2 - The velocity-versus-time graph of an object curves...Ch. 2 - For a uniformly accelerated car, is the average...Ch. 2 - A car traveling in the forward direction...Ch. 2 - A car starts from rest, accelerates uniformly for...Ch. 2 - Suppose that two runners run a 100-meter dash, but...Ch. 2 - Sketch a graph showing velocity-versus-time curves...Ch. 2 - A physics instructor walks with increasing speed...Ch. 2 - Prob. 36CQCh. 2 - Return to example box 2.4, but this time assume...Ch. 2 - Prob. 1ECh. 2 - Prob. 2ECh. 2 - Prob. 3ECh. 2 - Prob. 4ECh. 2 - Prob. 5ECh. 2 - Prob. 6ECh. 2 - Prob. 7ECh. 2 - Prob. 8ECh. 2 - Prob. 9ECh. 2 - Prob. 10ECh. 2 - Prob. 11ECh. 2 - Prob. 12ECh. 2 - Prob. 13ECh. 2 - Prob. 14ECh. 2 - Prob. 15ECh. 2 - Prob. 16ECh. 2 - Prob. 17ECh. 2 - Prob. 18ECh. 2 - Prob. 1SPCh. 2 - Prob. 2SPCh. 2 - Prob. 3SPCh. 2 - Prob. 4SPCh. 2 - Prob. 5SP
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- You are driving along Lawrence Ave. to speed up to try to make it through the intersection before it turns red (poor decision!). Your car accelerates at 1.3 m/s?. You reach the light after accelerating for 4.3 seconds. What is your speed at the light in m/s? 60 km/h. You see the traffic light ahead is still green and decide V, =v, +aAt A: Pictorial Representation Sketch showing events, describe events, coordinate system, label givens & unknowns with symbols, conversions B: Physics Representation Motion diagram, motion graphs, velocity vectors, events a +x t t C: Word Representation Describe motion (no numbers),-assumptions, estimated result (no calculation) D: Mathematical Representation Describe physics of steps, complete equations, algebraically isolate, substitutions with units, final statement of prediction E: Evaluation Answer has reasonable size, direction and units? Why?arrow_forward2. An object moves along the x-axis with its position measured relative to the origin so that its acceleration at anytime t > 0 is 4 m/s² . The initial velocity is -50 m/s. a. Determine the instantaneous velocity at anytime t. b. What is its velocity after 10 seconds? 15 seconds? b) - 10 m/s ; 10 m/s 10 m/s ANS: a) v(t) = 4t – 50arrow_forward8. A person standing on a 25-m high ledge atop a cliff drops a rock. At the same time, another person at the base of the cliff throws another rock straight upward at a speed of 15 m/s. Assume that air resistance is negligible and g = 9.8 m/s². How high from the base of the cliff will the two rocks meet?arrow_forward
- QUESTION 2 The NEXT morning, you wake up in a strange room yet again, and this time you drop a ball from a height of 1.42 m above the floor. The ball hits the floor 0.430 s after your drop it. You guess that you must have been taken to an alien planet with gravity different from Earth s. What is this planet s g (that is, the magnitude of the acceleration due to gravity on this planet)? A 24.6 m/s^2 B 15.4 m/s^2 C 7.7 m/s^2 D 11.6 m/s^2arrow_forwardAn object moves along the xy-plane. At some instant, its velocity and acceleration are~v = (3 m/s) ˆj , ~a =0.5 m/s2ˆi 0.2 m/s2 ˆj. At this instant, the object isA. speeding up and following a curved path.B. speeding up and moving in a straight line.C. slowing down and following a curved path.D. slowing down and moving in a straight line.E. none of these.arrow_forwardIn which of the following scenarios is the object speeding up? Please select ALL that applies. Asume that both v and a are in the x direction. a. v = 20 m/s, a = -10 m/s^2 b. v = 5 m/s, a = 20 m/s^2 c. v = 0 m/s, a = -10 m/s^2 d. v = -30 m/s, a = 0 m/s^2 e. v = -15 m/s, a = -5 m/s^2 f. v = 0 m/s, a = 20 m/s^2arrow_forward
- You are driving along Lawrence Ave. at 60 km/h. You see the traffic light ahead is still green and decide to speed up to try to make it through the intersection before it turns red (poor decision!). Your car accelerates at 1.3 m/s?. You reach the light after accelerating for 4.3 seconds. What is your speed at the light in m/s? v, =v, +aAt A: Pictorial Representation Sketch showing events, describe events, coordinate system, label givens & unknowns with symbols, conversions B: Physics Representation Motion diagram, motion graphs, velocity vectors, events LLL. a +x t C: Word Representation Describe motion (no numbers),-assumptions, estimated result (no calculation) D: Mathematical Representation Describe physics of steps, complete equations, algebraically isolate, substitutions with units, final statement of prediction E: Evaluation Answer has reasonable size, direction and units? Why?arrow_forwardDetermine s and a when t= 3 s if s=0 when t= 0. v (m/s) t (s) 4 2. 2.arrow_forward4. A car is driving at a speed of 25 m/s on a horizontal road. Determine the minimum distance in which the car will stop in each of the following cases. A. On a rainy day where µs = 0.125. B. On a sunny day where us = 0.650.arrow_forward
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Position/Velocity/Acceleration Part 1: Definitions; Author: Professor Dave explains;https://www.youtube.com/watch?v=4dCrkp8qgLU;License: Standard YouTube License, CC-BY