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Physics 1A, Section 6

Physics 1A, Section 6. December 1, 2008. Section Business. Last homework is due Wednesday. Quiz 4 grades: median = 12.0 out of 20 mean = 12.1 out of 20 Thursday in Section 6: Sample problems to recall topics for final Course review handout?. Quiz 4, Prob. 1. Answer:

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Physics 1A, Section 6

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  1. Physics 1A, Section 6 December 1, 2008

  2. Section Business • Last homework is due Wednesday. • Quiz 4 grades: median = 12.0 out of 20 mean = 12.1 out of 20 • Thursday in Section 6: • Sample problems to recall topics for final • Course review handout?

  3. Quiz 4, Prob. 1 • Answer: • a) L = 0, K = 0, U = ½ cq2i2 • b) K1max = (I2/(I1+I2))Ei • = (I2/(I1+I2)) ½ cq2i2 • c) w = sqrt(c(I1+I2)/(I1I2))

  4. Quiz 4, Prob. 2 • Answer: • a) wA = sqrt[10g(S-H)/(7R2)] • b) vB = sqrt(gh) • c) gS = gh + 7vB2/10 • d) h = 10S/17

  5. Reading/Lecture Review • T.M.U. Chapters 16-17 + lectures: • ellipses: center C, focus F • semi-major axis a, eccentricity e • semi-minor axis b = a √(1-e2) • Orbits: E = K + U and L are constant: • in polar coordinates: r = ed/(1 + e cosq) • ellipse: K + U = E < 0, 0 ≤ e < 1 • parabola: E = 0, e = 1 • hyperbola: E > 0, e > 1 • Elliptical orbits: E = -GmM/(2a) L2 = Gm2Ma(1-e2) T2 = 4p2a3/(GM) b ea a F C

  6. Final Prob. 20

  7. Final Prob. 20 • Answer: • K = GMm/(16R), • U = -GMm/(4R), • L = m sqrt(2GMR) • b) elliptical, a = 8R/3 • c) hmin = R/3 • vmax = ¾ sqrt(2GM/R) • d) Dt = • (16p/9) sqrt(6R3/(GM))

  8. Thursday, December 4: • review problems for final

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