A) Find the angular speed of the bar just after the collision. w(omega)=? rad/se

Question

A) Find the angular speed of the bar just after the collision. w(omega)=? rad/sec
B) During the collision, why is the angular momentum conserved but not the linear momentum? A) Find the angular speed of the bar just after the collision. w(omega)=? rad/sec
B) During the collision, why is the angular momentum conserved but not the linear momentum? A) Find the angular speed of the bar just after the collision. w(omega)=? rad/sec
B) During the collision, why is the angular momentum conserved but not the linear momentum? A thin, uniform, metal bar, 2.5 long and weighing 90 , is hanging vertically from the ceiling by a frictionless pivot. Suddenly it is struck 1.5 below the ceiling by a small 4-kg ball, initially traveling horizontally at 13 . The ball rebounds in the opposite direction with a speed of 7 . A) Find the angular speed of the bar just after the collision. w(omega)=? rad/sec
B) During the collision, why is the angular momentum conserved but not the linear momentum?

Explanation / Answer

mass of metal bar = 90/9.8 = 9.18 kg.......

4*13*1.5 = (9.18*2.5^2/3)*w - 4*1.5*7

===>w = 4*1.5*(13+7)/(9.18*2.5^2/3)=6.27 rad/s

b) because it is not an elastic collision....

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