An overhead door is guided by wheels at A and B that roll in horizontal and vertical

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An overhead door is guided by wheels at A and B that roll in horizontal and vertical tracks. Knowing that when θ = 40° the velocity of wheel B is 1.5 ft/s upward, determine 

(a) The angular velocity of the door, 

(b) The velocity of end D of the door.

An overhead door is guided by wheels at A and
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Vector Mechanics for Engineers Statics and Dynamics

ISBN: 978-0073398242

11th edition

Authors: Ferdinand Beer, E. Russell Johnston Jr., David Mazurek, Phillip Cornwell, Brian Self

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