ch 6 hw 3

# ch 6 hw 3 - Ch6 HW3 f10 Page 1 of 4 WebAssign Ch6 HW3...

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Assign Ch6 HW3 f10 (Homework) Ashlyn Baum Physics 303K, section B, Fall 2010 Instructor: Jim Chelikowsky Current Score : 24 / 26 Due : Sunday, October 10, 2010 11:30 PM CDT 1. 2/2 points Question: MI3 6.7.P.068 You push a box out of a carpeted room and along a hallway with a waxed linoleum floor. While pushing the crate 2 m out of the room you exert a force of 25 N; while pushing it 6 m along the hallway you exert a force of 11 N. To bring it to a stop you exert a force of 6 N through a distance of 0.8 m, opposite to the motion. How much work do you do in all? 111.2 111 J Solution or Explanation W = 1 · 1 + 2 · 2 + 3 · 3 Be careful about signs: 3 · 3 = F x 3 x 3 is negative , since the force has a negative x component. 2. 4/4 points Question: MI3 6.7.P.069 A crate with a mass of 60 kg glides through a space station with a speed of 3 m/s. An astronaut speeds it up by pushing on it from behind with a force of 190 N, continually pushing with this force through a distance of 6 m. The astronaut moves around to the front of the crate and slows the crate down by pushing backwards with a force of 170 N, backing up through a distance of 4 m. After these two maneuvers, what is the speed of the crate? final speed = 4.932 4.93 m/s Solution or Explanation K f - K i = work = F x 1 x 1 + F x 2 x 2 Pay attention to the sign of the x component of the force! 3. 2/4 points Question: MI3 6.4.P.059 4. 7/7 points Question: MI3 6.15.P.102.alt02 5. 6/6 points Question: MI3 6.4.X.052 6. 3/3 points Question: MI2e 5.RQ.55 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Page 1 of 4

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## This note was uploaded on 11/21/2010 for the course PHY 56665 taught by Professor Chelikowsky during the Fall '10 term at University of Texas.

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ch 6 hw 3 - Ch6 HW3 f10 Page 1 of 4 WebAssign Ch6 HW3...

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