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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
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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»
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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
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 Fall '02
 IrinaIonescu

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