homework3 - CE 222 ENGINEERING MECHANICS II ( FALL 2003...

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CE 222 ENGINEERING MECHANICS II ( FALL 2003 – 2004 ) EXERCISE SHEET III ( http://www.ce.metu.edu.tr/~ce222 ) 1. The 7 kg rod BC connects a disk centered at A to crank CD. Knowing that the disk is made to rotate at the constant speed of 180 r/min, determine for the position shown the vertical components of the forces exerted on rod BC by the pins at B and C 2. The 240 kg crate is being lowered by means of two overhead cranes. As the crate approaches the ground, the crane operators apply brakes to slow the motion. Determine the acceleration of each cable at that instant, knowing that T A =1900 N and T B =1600 N. 3. A hemisphere of mass m and radius r is released from rest in the position shown. Determine (a) the minimum value of m s for which the hemisphere starts to roll without sliding, (b) the corresponding acceleration of point B. 4. The slender bar weighs 50N and the disk weighs 100N. The coefficient of kinetic friction between the disk and the horizontal surface is m k =0.1. If the disk has an initial counterclockwise angular velocity of 10 rad/s, how long does it take to stop spinning?
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homework3 - CE 222 ENGINEERING MECHANICS II ( FALL 2003...

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