physics7B-sp09-final-Huang-exam

physics7B-sp09-final-Huang-exam - University of California...

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1 University of California, Berkeley Physics 7B, Lecture 001, Spring 2009 ( Xiaosheng Huang ) Final Exam Thursday, 5/14/2009 8:00 – 11:00 AM Name:_______________________SID: ________________________ D/L Section:__________________GSI: ________________________ Physical Constants: Avogadro's number, N A : 6.02 × 10 23 Gas Constant, R : 8.315J/mol·K Boltmann's Constant, k B : 1.38 × 10 -23 J/K Stefan-Boltzmann Constant, σ : 5.67 × 10 -8 W/m 2 ·K 4 Standard Temperature and Pressure (STP): T =273K, P =1atm=1.01 × 10 5 Pa Atomic mass unit (1u): 1.6605 × 10 -27 kg Speed of light, c : 3.00 × 10 8 m/s Mass of electron, m e : 9.11 × 10 -31 kg Elemental charge, e : 1.60 × 10 -19 C Permittivity of free space, ε 0 : 8.85 × 10 -12 C 2 /N m 2 Permeability of free space, μ 0 : 4 π× 10 -7 T m/A Note : You are allowed three formula sheets (3 ½ ” by 5”, double sided) and a calculator (without wireless capabilities). Do NOT just write down an answer in the answer box; show your steps. Formulaic answers may only involve the quantities given in a problem and constants. Please pay attention to whether you are asked to give a numerical answer or a formulaic answer. Best of Luck! #1 #2 #3 #4 #5 #6 #7 Total “Joy and amazement of the beauty and grandeur of this world of which man can just form a faint notion …" Albert Einstein

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2 1. (15 pts.) A conducting rod with mass m is free to slide on two parallel rails separated by a distance L with negligible friction. At the right end of the rails, a voltage source of strength V in series with a resistor of resistance R makes a closed circuit together with the rails and the rod. The rails and the rod are taken to be perfect conductors. The rails extend
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physics7B-sp09-final-Huang-exam - University of California...

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