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Unformatted text preview: 4/25/08 10:31 AM CH6 HW4 2008 Page 1 of 3 http://www.webassign.net/v4cgikseiloff3@gatech/student.pl?h=20080425142522kseiloff3@gatech1286165155 CH6 HW4 2008 (Homework) KRISTIN SEILOFF PHYS 2211 M & N Spring 08, section N05, Spring 2008 Instructor: Jennifer Curtis Web Assign Current Score: 16 out of 16 Due: Wednesday, March 12, 200812:00 PM EDT 1. 6/6 points Review of the woman, the barbell, and the Earth (Section 6.7 in the textbook). Starting from rest, a woman lifts a barbell with a constant force F through a distance h , at which point she is still lifting, and the barbell has acquired a speed v . Let E woman stand for the following energy terms associated with the woman: E woman = E chemical,woman + K woman (moving arms etc.) + U grav,woman+Earth + E thermal,woman The change in the kinetic energy of the barbell is (1/2) mv 2- 0 = (1/2) mv 2 . The general statement of the energy principle is E sys = W ext . We'll consider terms on the left side of the equation (the E sys side, changes in the energy inside the system) and terms on the right side (the W ext side, energy inputs from the surroundings)....
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