# CH6 HW4 - WebAssign CH6 HW4(Homework Current Score 16 out...

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Arthur Barfield PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 16 out of 16 Due: Friday, October 24, 2008 09:00 AM EDT Description Open and Closed Systems The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2 06.X.09.01] 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). I. System: Woman + barbell + Earth For the system consisting of the woman, the barbell, and the Earth, which of the following terms belong on the left side of the energy equation (the E sys side)? none of these terms (left side is 0)

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CH6 HW4 - WebAssign CH6 HW4(Homework Current Score 16 out...

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