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Physics 1A, Section 6 October 27, 2008
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Section Business Section 6 for Monday, Nov. 3 is canceled.
Visit another section if you wish. Office hour for Nov. 4 is unchanged. Homework due Wednesday: Consider solving problems QP21 and QP28 in non-inertial frames with pseudoforces.
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Week 4 Reading/Lecture Recap
T.M.U. chapters lectures: gravity: F = GM1M2/r2, always attractive electric charges: F = Keq1q2/r2, attractive or repulsive springs: F ≈ -kx normal forces kinetic friction: F ≈ mkN, opposes relative velocity static friction: F ≤ msN, opposes relative acceleration viscous force: F ≈ -Khv pseudoforce in linearly accelerating frame: -ma0 pseudoforce in rotating frame: mw2r outward There is also a Coriolis force on moving objects (Chapter 14). radius of black hole: r = 2GM/c^2
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Quiz Problem 29
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Quiz Problem 29 Answer: mA to the left
ma = mAcosq – mgsinq – mN, N = m(Asinq + gcosq) a = A(cosq – msinq) – g(mcosq + sinq); q < 37°
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Quiz Problem 49
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Quiz Problem 49 Answer: {[k3 + (k1-1 + k2-1)-1]-1 + k4-1]-1
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Tension in a Rope Draped over a Table
mass per unit length r L
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Tension in a Rope Draped over a Table
mass per unit length r T = rgL T T T L
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Thursday, October 30: Quiz Problem 50 (energy and work)
something about potential energy Optional, but helpful, to look at these in advance.
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