Class 21 Notes

# Class 21 Notes - As you arrive today please ﬁll out an...

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Unformatted text preview: As you arrive today, please ﬁll out an evaluation (for your lecture section only). Blank forms are available on the front tables, as are some pencils. (Please return all borrowed pencils—thanks.) When you ﬁnish, please give your completed form to the student volunteer. Thank you. PH 201 (Fall term, 2009) Instructor: Lecture section: Chris Cofﬁn 001 = 8:00 a.m. 002 = 9:00 a.m. 003 = 3:00 p.m. 11/13/09 Oregon State University PH 201, Lecture #21 1 A block (m = 2.0 kg) is hanging by a thin, massless thread that is wrapped many times around a pulley (radius = 0.040 m; I = .0011 kg·m2). Initially the pulley is prevented from rotating; the block hangs at rest. Then the pulley is allowed to rotate accordingly; the thread does not slip on the pulley. Find the tension in the thread and the angular acceleration of the pulley. 11/13/09 Oregon State University PH 201, Lecture #21 2 Practice with a “no-solve” situation: Two walls are separated by a distance, D. A rigid, uniform board of length L is propped between the two walls. Wall 1 is smooth (frictionless). There is static friction (μs) between Wall 2 and the board. What is the maximum board length, L? 11/13/09 Oregon State University PH 201, Lecture #21 3 ...
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Class 21 Notes - As you arrive today please ﬁll out an...

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