Phys 0174 - CEx _7 Solution

Phys 0174 - CEx _7 Solution - COMPUTEREXERCISE#7Solution:...

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COMPUTER EXERCISE #7 Solution: Phys 0174 Fall 2008 P. Koehler   Names of team members: P. Koehler Date: 10/4/2008 Score: (Max. = 60) Answers to Problem 1: value unit (a) work done by worker= 1769 J (b) work done by friction= -1277 J (c) work done by gravity= 0.00 J (d) work done by normal force= 0.00 J (e) sum of (a) through (d) = 493 J (f)  work done by net force= 493 J (g) final speed of crate= 3.62 m/s Answers to Problem 2: Ug [J] K [J] E [J] (a) point P 0.404 0.000 0.404 (b) point B  0.000 0.404 0.404 (c) point Q  0.081 0.323 0.404 (d) point T  0.162 0.243 0.404 (e) hmin = 0.38 m Answers to Problem 3: value unit (a) speed of the package just before it hits the spring= 7.29 m/s (b) maximum compression of the spring= 1.06 m (c) closest approach to starting point when rebounding= 1.33 m Instructions:   Do all 3 problems that are given in the sheets that follow this TOP SHEET and the EQUATIONS sheet.  Your answers to  the problems will be automatically copied into the indicated cells on this TOP SHEET.  Do not try to enter them yourself. If you manage to corrupt your copy of this file, don't get upset; just  reload the original file.  If you do not complete this exercise during the class time, save your work on a floppy disk or a mass storage device and  finish the work at home with your team members.  When your team is done,  print out just this TOP SHEET and hand it in to me.   Make sure the names of all members of  your team are shown, including yourself.   Please submit only one print-out per team.     Your print-out for this Computer Exercise must be turned in to me no later than the end of your next Computer  Exercise Session during the week of October 13th.   S
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Here are some relationships that may be helpful: Work is the scalar (or dot) product of the force vector F and the displacement vector d : W = | F |·| d |·cosθ = F x d x + F y d y + F z d z Kinetic Energy is defined as: K = ½mv 2 Gravitational Potential Energy is defined as: U g = mgy Elastic Potential Energy is defined as: U e = ½ kx 2 where k=spring constant and x=displacement of the spring from its relaxed length The Work-Kinetic Energy Theorem states that the total work done on an object is equal to the change in its kinetic energy: W total = ΔK = K final - K initial The gravitational force and the elastic force are examples of
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Phys 0174 - CEx _7 Solution - COMPUTEREXERCISE#7Solution:...

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