ch03-motion-in-two-or-three-dimensions

ch03-motion-in-two-or-three-dimensions - MasteringPhysics:...

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10/13/08 1:09 AM MasteringPhysics: Assignment Print View Page 1 of 9 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1156014 [ Print View ] Introductory mechanics Chapter 03 - Motion In Two Or Three Dimensions Due at 11:59pm on Tuesday, September 23, 2008 View Grading Details Position, Velocity, and Acceleration Learning Goal: To identify situations when position, velocity, and /or acceleration change, realizing that change can be in direction or magnitude. If an object's position is described by a function of time, (measured from a nonaccelerating reference frame), then the object's velocity is described by the time derivative of the position, , and the object's acceleration is described by the time derivative of the velocity, . It is often convenient to discuss the average of the latter two quantities between times and : and . Part A You throw a ball. Air resistance on the ball is negligible. Which of the following functions change with time as the ball flies through the air? Hint A.1 Newton's 2nd Law Hint not displayed ANSWER: only the position of the ball only the velocity of the ball only the acceleration of the ball the position and velocity of the ball the position and the velocity and acceleration of the ball Part B You are driving a car at 65 mph. You are traveling north along a straight highway. What could you do to give the car a nonzero acceleration? Hint B.1 What constitutes a nonzero acceleration? Hint not displayed ANSWER: Press the brake pedal. Turn the steering wheel. Either press the gas or the brake pedal. Either press the gas or the brake pedal or turn the steering wheel. Part C A ball is lodged in a hole in the floor near the outside edge of a merry-go-round that is turning at constant speed. Which kinematic variable or variables change with time, assuming that the position is measured from an origin at the center of the merry-go-round? Hint C.1 Change of a vector Hint not displayed ANSWER: the position of the ball only the velocity of the ball only the acceleration of the ball only both the position and velocity of the ball the position and velocity and acceleration of the ball Part D [ Print ]
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10/13/08 1:09 AM MasteringPhysics: Assignment Print View Page 2 of 9 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1156014 For the merry-go-round problem, do the magnitudes of the position, velocity, and acceleration vectors change with time? Hint D.1 Change of magnitude of a vector Hint not displayed ANSWER: yes no An Object Accelerating on a Ramp Learning Goal: Understand that the acceleration vector is in the direction of the change of the velocity vector. In one dimensional (straight line) motion, acceleration is accompanied by a change in speed, and the acceleration is always parallel (or antiparallel) to the velocity. When motion can occur in two dimensions (e.g. is confined to a tabletop but can lie anywhere in the x-y plane), the definition of
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ch03-motion-in-two-or-three-dimensions - MasteringPhysics:...

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