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ch 6 hw 6

# ch 6 hw 6 - Ch6 HW6 f10 Page 1 of 7 WebAssign Ch6 HW6...

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Web Assign Ch6 HW6 f10 (Homework) Ashlyn Baum Physics 303K, section B, Fall 2010 Instructor: Jim Chelikowsky Current Score : 21 / 27 Due : Sunday, October 24, 2010 11:30 PM CDT 1. 4/4 points Question: MI3 6.13.X.094 You throw a ball of mass 0.2 kg straight up. You observe that it takes 2.6 s to go up and down, returning to your hand. Assuming we can neglect air resistance, the time it takes to go up to the top is half the total time, 1.3 s. Note that at the top the momentum is momentarily zero, as it changes from heading upward to heading downward. (a) Use the momentum principle to determine the speed that the ball had just AFTER it left your hand. v initial = 12.74 12.7 m/s (b) Use the Energy Principle to determine the maximum height above your hand reached by the ball. h = 8.281 8.28 m Solution or Explanation p y = m ( v y, final - v y, initial ) = F y,ext t , where F y, ext = -mg . Choose the final state to be when the ball crests and momentarily has zero momentum. Therefore we have m (0 - v y, initial ) = - mg t Solve for the initial speed: v y, initial = g t E = W m(v f 2 - v i 2 ) = F y, ext y m (0 - v i 2 ) = (- mg )( h ) Solve for the height: 2. 7/7 points Question: MI3 6.14.X.096 3. 2/2 points Question: MI3 6.14.X.097 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Page 1 of 7 Ch6 HW6 f10 11/21/2010 http://www.webassign.net/[email protected]/[email protected]

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Two protons are a distance 7 10 –9 m apart. What is the electric potential energy of the system consisting of the two protons? U el = 3.29e-20 3.29e-20 joules If the two protons move closer together, will the electric potential energy of the system increase, decrease, or remain the same? A proton and an electron are a distance 7 10 –9 m apart. What is the electric potential energy of the system consisting of the proton and the electron? U el = -3.29e-20 -3.29e-20 joules If the proton and the electron move closer together, will the electric potential energy of the system increase, decrease, or remain the same? Which of the following statements are true?
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