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Exam_3_soln_summer_02

# Exam_3_soln_summer_02 - few Name SSN EGN 3321 Dynamics CL02...

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Unformatted text preview: few Name: SSN EGN 3321 Dynamics: CL02, CL71, CL81 ..Summer 2002, Exam 3 PROBLEM I (35 points) Knowing that at the instant shown rod AB has a constant angular velocity of 6 rad/s clockwise: a) draw and compute the velocity and acceleration of point B; b) draw and discuss the velocity and acceleration of point D; c) ﬁnd the angular velocity of link BE using the Instantaneous Center of Zero Velocity approach; (1) ﬁnd the angular acceleration of link BE and the acceleration of D. Name: ’9 —--y P d) Z; 7 a; + “85 >< 7735/6 'V w E 43/43 gig, I ,. , E (9.0? chb 1 O + b (>ng ——I.6L v3.26 ,. 0‘09 °é€ 0sz ole; Q! 0J8 «>40 1. , 0.03 oéecW {sz 2/3.24+o.22(ogg W ~45; ; 'asz/Sb’j PROBLEM 2 (30 points) : The motion of pin D is guided by a slot cut in rod AB and a slot cut in the ﬁxed plate Knowing that at the msta: 1t shown rod AB rotates with an angular velocity of 3 rad/s and an angular acceleration of 5 rad/s2 ,both counterclockwise, determine the acceleration of pin D Discuss every step in the solution (write down 1n words the directions of different veloctities and accelerations invLolved, draw diagrams for velocities and accelerations). Wig 45;: fl gave. 7‘44» 27M {my M(WWQ ﬂanged? J) mow -——a . . /M 0545—9 ‘ 4 W “‘70 (7 —’ 0/; ”/f * V1; 617:6')‘ )2) gr; L ”" 75 ‘ —%C6)30 NA/y‘¢n<{ / lo. 56 “—‘0 9f /o, 36 SC 95" E S»? 0 by mi /0 349225 PROBLEM 3 (35 points) A'm'etal hoop with a radius r = 6 in. is released from rest on the 20° incline. If the coefficients of static and kinetic friction are us = 0.15 and uk = 0.12, determine the angular acceleration CL of the hoop and the time t for the hoop to move a distance of 10 ft down the incline. The moment of inertia of the hoop about its center of mass is mrz. k w} 9\ Inge. a; 3(9wrb7" C1020) ii : orb/oz ad a O //8 ’ﬁ 9%?) Jam x/(L 075444 7%:4; a WW 52:7QP; ...
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Exam_3_soln_summer_02 - few Name SSN EGN 3321 Dynamics CL02...

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