# test17 - \‘l o FP'PPE" COE 2001 — Test 3 — Spring...

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Unformatted text preview: \‘l o FP'PPE" COE 2001 — Test 3 — Spring 2007 Name: K 9/ PLEASE NOTE: 1. If axes are speciﬁed for a given problem, you are to use them. Do not change them in any way or you get a 0 (zero) to that question. Show all work. If you make an assumption, state it clearly. Provide units with your answers, and box them. Use the back of the equation sheet as scrap paper if needed. The “lb” unit means “lb-force” in this test, NOT “lb—mass” (i.e. do NOT multiply by gravity to get a force!). Deﬁne clearly any new variable you introduce in a problem based on the givens. Pb. I (50 pts) — 3 small blocks are arranged as drawn below. The weights of block 1, 2, 3 are respectively 50 N, 30 N and 10 N. The pulley is massless and frictionless, and pinned at its center. The coefﬁcient of friction between block 1 and the incline is it, between blocks 2 and 3 it is 60% u, and between block 3 and the ﬂat ground it is 40% u. Disregard tipping. 1. Draw a FBD for each block separately. Specify clearly all forces with names and directions (ie don’t call all friction forces “1‘” and all normal forces “N”!) 2. Draw the axes you will use for each FBD, next to it. 3. What are the 2 possible cases to consider? What condition(s) must hold true for which friction force(s) for either case to work? 4. Calculate the minimum u to keep the system in equilibrium. 5> @@: © abouti‘omdmoiﬁwu [email protected]/@ SELL/s. l .‘. £:}LNU hzoﬁpwl/ «£3 <O4pklg Pb II (50 pts) — For the beam and loading drawn below, draw its shear force and bending moment diagrams. Fully label the diagrams (ie provide all values, etc). [0 9b 5 (lb 7/ Mam l 2W AMI—9‘ E uoiiom QéLeQJ" ,Te/ﬁ’g {_ x ﬂicks)“ OFeogeo WOVZWL osﬁéf“ V /\ ‘k 93%: MC lELVW 0W - J; h ...
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