II 44 Chapter II Planar Rigid Body Kinematics Homework Problem II 39 Part A Given At the position shown the angle between links AB and BE is 90 and E is moving to the right with a speed of vE Find For this problem a Locate the instant center for link BE b Using the instant center approach determine the angular speeds of links AB and BE in terms of vE Also determine the sense of rotation clockwise or counterclockwise for these links No credit will be given for using the vector approach in solving this problem B 2L 1 5L A E vE Chapter II Planar Rigid Body Kinematics Homework II 45 Problem II 39 Part B Given At the position shown links AB and HE are parallel and link AB is rotating counterclockwise with a speed of AB Find For this problem a Locate the instant center for link BE b Using the instant center approach determine the angular speeds of links BE and HE in terms of AB Also determine the sense of rotation clockwise or counterclockwise for these links No credit will be given for using the vector approach in solving this problem B E 2L L A AB 2L H II 46 Chapter II Planar Rigid Body Kinematics Homework Problem II 39 Part C Given At the position shown link AB is aligned with the center O of the stepped wheel and the wheel is moving to the right with O having a speed of vO Find For this problem a Locate the instant center for link AB b Using the instant center approach determine the sense of rotation of link AB clockwise or counterclockwise R vO O A 2R B 60 2R no slip C