Answers to even numbered problems appear below:
Due 1/29/98 B2:6) 25%; B2:9a) v(He) = 5.73 v(Xe), b) one, c) 1360 m/s; S16:22) 16 atm; S16:28) 2.49 kg; S16:36a) 4.14e-16 J, b) 7.04e5 m/s.
Due 2/5/98 B3:6a) +4kJ, b) 14K; B3:8) 8MJ; S17:26)Wab>0, delUab>0, Qab>0, Wbc=0, delUbc<0, Qbc<0, Wca<0, delUca<0, Qca<0; S17:28a) 7.5L, b) 300K.
Due 2/10/98 B4:8) eff. = 0.083@300K and falls of nonlinearly to 0.025@1000K; B4:10a) 40%, b) 60kJ, c) 90kJ.
Due 2/19/98 B5:8a) N1=73, N2=27, b) 0.027eV; B5:16a) exp(-392), b) exp(-20.4) = 1.4e-9; Handout(a) 2.7e-34, 0.37; b) 4e-32, 100; c) -12eV; d) N2 cannot be greater than E1 in thermal equilibrium; e) infinity, 27,380K; f) 4.8e-14Hz, 621nm; g) 0.022eV, sunlight would be transmitted through atmosphere, but sky would look black; h) ratio doesn't change (depends only upon energy difference, not # levels present); i) both N1 and N2 decrease (normalization constant decreases with added energy levels).
Due 2/24/98 B7:2a) +/- 0.057eV, b) 4.4 kT; B8:4) 3.21eV; B8:6a) 18km, b) 5.5e7 eV.
Due 3/5/98 19:4a) 8.23e-8N, b) 2.2e6m/s; 19:18a) 0.858 kNm^2/C, b) zero, c) 0.657 kNm^2/C; 19:26a) zero, b)0.365e6 N/C, c) 1.46e6 N/C, d) 0.65e6 N/C; 19:34a) zero, b) 8.0e7 N/C, c) zero, d) 0.735e7 N/C.
Due 3/19/98 20:8) -0.39V (initial position higher potential than final); 20:12a) zero, b)zero, c) 45 kV; 20:16a)-380nJ(-=>attractive), b) 103V; 20:20a) -11V, -32V, b) 7 V/m.
Due 3/24/98 20:30a) 48e-6C, b) 6e-6C; 20:46) 2.5e-3m^3.
Due 3/31/98 21:16a) const, b) double, c) double, d) const; 21:18) 448 A; 21:28a) 17ohms, b) 2A, 1.2A, 0.8A; 21:46) 2.2hrs.
Due 4/10/98 22:2a) 8.7e-14N, b) 5.2e13 m/s^2; 22:10a->b) zero; b->c) 4e-2N, along -x; c->d) 4e-2, along -z; d->a) 5.7e-2, midway between x and z; 22:16) 12.5T; 22:18) 2.6e-7T.
Due 4/16/98 23:8a) 0.5A, b) 2 W, c) 2W; 2312a) L->R, b) L->R, c) L->R, d) into page; 23:14) 19.6sin(314t) volts; 23:20) 14.2 cos(120t) mV.
Due 4/23/98 24:Q8) E accelerates charges; 24:6) 300sin(20pi*x-6pi e9t) V/m; 24:18a) 1.33e-8J/m^3, b) 1.33e-8J/m^3, c) 7.96 W/m^2; 24:34a) 6.88 units, b) 5.63 units; 24:40) 1e6J.
Due 4/30/98 9:Q10) Einstein won't see any image - frequencies of light incident shifted up out of visible range; 9:6) 0.87c; 9:8) 0.95c; 9:20a) 17.3m, b) 3.3 degrees.