Midterm_2_Solutions[09]

Midterm_2_Solutions[09] - MAE 101 _ Midterm Examination #2...

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Unformatted text preview: MAE 101 _ Midterm Examination #2 November 25, 2009 Instructor: Professor Gupta TA: Jason Citron; J aedal Jung DO ALL WORK ON THE EXAM ATTTACH ADDITIONAL SHEETS AS NEEDED WRITE YOUR NAME ON EVERY SHEET YOU USE BOX YOUR FINAL ANSWERS NOTE: ALL EQUATIONS OF EQUILIBRIUM MUST HAVE ASSOCIATED FREE BODY DIAGRAMS Problem 2 29 Problem 3 30 Problem 4 2.3 TOTAL (100) :00 l Problem 1 25 NAME: SOLUTIONS ID: Problem I: For the beam shown below, draw the bending moment and shear force diagrams along the centerline of the beam. The beam is subjected to a vertical and a horizontal force of magnitude F. The horizontal force acts at point “a” of the cross section as shown in the figure. stem: {2anwa as ex Eff-‘0 = RANKWO 23’ PHEE? 1‘ QEMACD 1"%+LRE +h§1:0 «=7 Q23“: M Mbfl K”... ANAL; ,th a ea: sass m9; Problem 2: A flat triangular slab of weight W and uniform thickness (t) is to be mounted on three identical vertical springs, each with spring constant K, that rest on a flat, horizontal floor. Each of the springs will support one corner of the slab (A, B, and C). Determine the force in each spring when the slab is mounted on the springs. The geometrical dimensions of the slab are given in the figure. f! ‘ i t | '9 iMa ’30 WEED“ Q51 On Big) Lea «w tc.(%5b‘> i W (sari) Problem 3: A rigid, uniform bar, AB, of negligible weight, is 5 feet long, and is supported by a steel rod, CD. Directly under point B is a wooden block, and a measurement shows that there is a clearance of 0.005 inches between the bar and the top of the block. After this measurement, a load P is applied to the rigid bar at point B. a) What is the load P necessary to cause the bar to first touch the top of the wooden block? b) What is the axial stress in rod CD when the bar first touches the top of the block? c) If the load P is twice the value as in (a), what is the axial stress in the wooden block? Assume pin connections at A, C and D. The properties of the wooden block and the steel rod are: — Cross-Sectional Area Modulus of Elasticit Wooden Block 15*10 si Steel Red CD 30*10 psi Parliament-*5: {3 Fees. 57’ lac” D .. '3 § .QOS"? lnt‘i‘ififl 3; r g ‘ etaaeefififii‘ Problem 4: A clutch is a device used to connect and disconnect two coaxial rotating shafts. The type shown below consists of disks of radius r attached to the ends of the shafts. When the disks are separated (Figure a), the clutch is disengaged, and the shafts can rotate freely relative to each other. When the clutch is engaged by pressing the disks together with axial forces F (Figure b), the shafts can support a couple M due to the friction forces between the disks. If the couple M becomes too large, the clutch slips. Derive the equation for the maximum couple M that the clutch can support without relative slipping between the discs. Assume that the pressure is uniformly distributed over the face of each disk (that is, it is independent of the radius), and that the coefficient of static friction between the two disks is pg. (l3) Om :. Zwrdr wedifgafiemfiai eiemmb 0‘3 W ‘q mirage as total Mast era; 0?- die: gfiuwfi mwgna gmrmtlgge, engrjés Ox Ltni—QOfm mfim f) new”, PM?" n91 M a: t mad?“ 1‘ T/‘sifigfim—F’rd“) coir -. ...
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This note was uploaded on 12/09/2009 for the course MAE 210306200 taught by Professor Chatterjee during the Fall '09 term at UCLA.

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Midterm_2_Solutions[09] - MAE 101 _ Midterm Examination #2...

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