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db_lec04_post - Issues/Help Center Phys 221 Lab questions...

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Issues/Help Center 1/23/12 1 Phys 221 Lab questions, Dr. Lewicki, Room 142, [email protected] I-clicker Problems, Dr. Saxena, Room 176, [email protected] HELP CENTER PHYSICS 21900 AND PHYSICS 22100 SPRING 2012 ROOM 11A MONDAY TUESDAY WEDNESDAY THURSDAY FRIDAY 8:00-8:30 8:30-9:00 CHENG, JUN CHENG, JUN JENSEN, DANIEL CHENG, JUN 9:00-9:30 CHENG, JUN CHENG, JUN JENSEN, DANIEL CHENG, JUN 9:30-10:00 CHENG, JUN HRUBY, LORENZ CHENG, JUN JENSEN, DANIEL CHENG, JUN 10:00-10:30 CHENG, JUN HRUBY, LORENZ JENSEN, DANIEL 10:30-11:00 CHENG, JUN MEHTA, JIGNESH 11:00-11:30 MEHTA, JIGNESH 11:30-12:00 RADU, MARIUS 12:00-12:30 RADU, MARIUS PIENAAR, JACQUES 12:30-1:00 RADU, MARIUS PIENAAR, JACQUES SHI, SHUKUN 1:00-1:30 RADU, MARIUS SHI, SHUKUN 1:30-2:00 KRAMER, ANDREW 2:00-2:30 KRAMER, ANDREW 2:30-3:00 KRAMER, ANDREW 3:00-3:30 ERDMAN, DARREN ERDMAN, DARREN KRAMER, ANDREW 3:30-4:00 ERDMAN, DARREN WANG, HAOYU ERDMAN, DARREN 4:00-4:30 CHENG, JUN WANG, HAOYU 4:30-5:00 WANG, HAOYU 5:00-5:30 WANG, HAOYU
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Other issues 1/23/12 2 You have to register you Iclicker on CHIP 38 students in this section have not yet registered the Iclicker #001E514F,2,2,1,3 #076B3458,1,1,1,2 #08017F76,0,0,1,1 #0DC213DC,2,2,1,3 #0DC2AD62,1,1,1,2 #0DEF9674,2,2,1,3 #148BCC53,0,0,1,1 #1748B9E6,2,2,1,3 #1D3FEDCF,0,0,1,1 #1F4C3665,2,2,1,3 #811754C2,1,1,1,2 #82AC9FB1,2,2,1,3 #833A79C0,0,0,1,1 #834618DD,2,2,1,3
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1/23/12 3 PHYS 221 Lecture 4 Last Lecture Φ E = q enc ε o Φ E = EA cos θ Gauss’ Law Very useful to determine E when there is symmetry
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1/23/12 4 From Mechanics (PHYS 220) Work done by a conservative force is independent of path. • Energy Conservative Forces: Potential Energy: associated with the configuration of the system Kinetic Energy: associated with the state of motion KE = 1 2 mv 2 PE ( gravity ) = mgh PE ( spring ) = k 2 x 2 W=F Δ x if F and Δ x are parallel PE = W W = F Δ x cos θ
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1/23/12 5 Gravitational potential energy Δ PE = - W grav.field W = F .
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