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exam3_soln_fall01 - Name Section SSN On my honor as a...

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Unformatted text preview: Name: Section: SSN: On my honor as a student, I have neither given nor received aid on this test. Pledged: EGN 3321: DYNAMICS FALL 2001 EXAM #3 1. (35 points) The angular velocity of link AB is co AB= 4 rad/s counterclockwise. At the instant shown: 6 = 60°, 4) = 45°. Link CB has a length of 350 mm and is in a horizontal position. The length of link AB is 500 mm, Determine: o the velocity of the collar at C, vc, 0 the angular velocity of link CB, coca Solve the problem using: a) the vector method (15 points); b) the instantaneous center of velocity method (15 points). Draw clearly the directions of the velocities of various points and links!(5 points) b) I a Mob Och/C 4'8 ; —» F @A/e ' (Um lbs/A * 4(1) 3 QM/g & @6‘3’6604 C 3 0/; y (carzxifitcxljfi) IC 6 Ms @ +6.; migrant- 4% MLL v6) and #c1 740 it; W’s” was» MIC @ @ 'VC wag ”CAT; (9 2. Name: x AL $5636" a 64 30 , as 0 0 GD 6) “My,” pd/fi O V ’,3§ L006) 2. (30 points) The crankshafi AB of an engine turns with a clockwise angular acceleration of OLAB = 20 rad/secz. At this instant (DAB = 10 rad/s clockwise and mac = 2.43 rad/s counterclockwise. The length of arm AB is 0.25 ft and the length of arm BC is 0.75 it. Determine: 1) the acceleration of point B, 2) the acceleration of the piston C. Draw these accelerations on the picture. ._> ——-’ a 7' —’ 09 Ole. 7 g}: + erthA ‘* We’ll/A O _._) _ WM - -025 ,5“ 43° L + Ozgcflhf A L 3 Y’ —02§<aw15’\ % Q03 7 O O ' 20 ’ Q83 , 0.24504 ~0288x731§ .ZSCMA O 20 Q2: 9:345 / > > 1 -043; ’ ~ (0 ) 20622:) 31:4? 0'03 —-) 2N7, ‘5 ’ , \ma Q6? zizt ~l4l41‘S ($732) ——> a a —/> 7. ——> L) GC7Q£+ 016¢th8~OOgcnqg a a— flag a oas swag L + Loafm13é' 3 T. T ‘2 O W’S Srw lg (:1 2L), 7, 1 + O O 0&5; ’- @.Q3> «MM QC ORSSsEuBf ’F . O 0 31 to ‘3 L Name: o “.1 “0165 0'35 C")\3.Q 0.4% a 7 + ' (Ms) a 44m, 0229 ‘ “\' Oéec 0%? 87:8 L O 2 2|.f?’ —' 0.9?‘3 OLEC ’LOL‘ 0 7 233} —— (ya/25%; J> “(3c 7 219 ”Lag/A17 0c 4 0.91m!“ ‘18.“ “‘3 QC ’ "3-6 #752 glanced» 1‘me fwd!» ‘4 3. (35 points) A drum of 4 in radius is attached to a disk of 8 in radius. The disk and drum have a W combined weight of 10 lb and a combined radius of gyration of 6 in. A cord is attached as shown and pulled with a force P of magnitude 5 lb. Knowing that the coefficients of static and kinetic friction are us = 0.25 and M = 0.20, respectively, determine: a) whether or not the disk slides; b) the angular acceleration of the disk and the acceleration of G. 3’ ”W” W . 6a 2 om 1 7<§-o< . %;CA}\‘ in“ (:4 MW 1 P (@669 s 0.2/566 «X ~20<2 aiazg/(fij/SL 2 ‘ 7;) 1&2 5/53 %/sz ——9} Name: 0 Section: SSN: ___‘___—_ . ~ H, :5 ~ ed- M w W “W ”"3” “g ngzom , ‘-§+P= wa- ,-]j; + 6 7 3fz<6453) ¢ 40 /E 77; 3. +TZ'%2\O Nfi‘X/"O N7W 5‘0“.“ #5” VS” ’ M00) =- am ___,) $15K sqbes L a) i? =ng v 0.100) 7.2N b) :9 Z'szma r ——:F3;+P=0770. '2 +3 2 "(5°21 a 93 IQ.a gang/51%| +> 2% fifflaw ‘ W: ‘ Wi) ’ 1* ’ ””8“ 8 ‘1 Id 2 4.23 ”id/s7" j ...
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