lecture 41 - E=mc^2

# lecture 41 - E=mc^2 - Announcements4/11/11 Prayer

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Announcements 4/11/11 Prayer Wednesday: Project Show & Tell. The lucky winners are: a. Michael Meehan & Nick Prestwich – Doppler effect b. Conrad Rosenbrock & Mike Abrahamson – evaporative cooling c. Matt Pitts, Marcus Holden, Cody Petrie – refraction of light d. Alan Snow – demos: air & water “whirlpools” You will present in that order; a 10 minute cut-off for each group. Final exam: Sat, Apr 16 –  Wed Apr 20 , in Testing Center Final exam review – On Thurs or Friday. Vote for times!  FoxTrot, by Bill Amend

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HW 37-3: Elastic Collision 1000 0.59 1200 0.4 2200 0.05 c c c × - × = - × 9 m/s 3 m/s 6 m/s v 1,after = ? v 2,after = ? Check: (1)(9) + (2)(0) = -(1)(3) + (2)(6) 9 = 9 4 m/s 8 m/s 1 m/s 1 kg 1 kg 2 kg 2 kg 1 kg 2 kg 1 kg 2 kg 5 m/s 5 m/s Check: (1)(4) - (2)(5) = -(1)(8) + (2)(1) -6 = -6 0 m/s ? ?
Elastic Collision 1000 0.59 1200 0.4 2200 0.05 c c c × - × = - × 0.9 c 0.3 c 0.6 c Check: (1)(0.9) + (2)(0) = -(1)(0.3) + (2)(0.6) 0.9 = 0.9 0.73 c 0.70 c 0.14 c 1 kg 1 kg 2 kg 2 kg 1 kg 2 kg 1 kg 2 kg 0.5 c 0.5 c Check: (1)(0.73) - (2)(0.5) = -(1)(0.70) + (2)(0.14) -0.27 = -.41 Х 0 m/s ?

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lecture 41 - E=mc^2 - Announcements4/11/11 Prayer

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