- #1
tj00343
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The rigid 30-lb plank is struck by the 15-lb hammer
head H. Just before the impact the hammer is gripped
loosely and has a vertical velocity of 75 ft>s. If the coefficient
of restitution between the hammer head and the plank is
e = 0.5, determine the maximum height attained by the 50-lb
block D. The block can slide freely along the two vertical
guide rods. The plank is initially in a horizontal position.
link to diagram :
http://s3.amazonaws.com/answer-board-image/cc993076-7bbb-4ab8-936b-9788a74b8565.png
I applied the conservation of angular mom. thm, but after checking the solution manual ,
I realized that they applied the thm but adding for the whole system ,they took for the plank ,hammer, and block, m(Vg)*(distance to point B) , BUT (this is my real quistion ) ,for the plank they did , [m(Vg)*(distance to point B)] +[Ig*w] ...my quistion is why was'nt the Igw term added for the block and hammer ,and why was it added to the plank
head H. Just before the impact the hammer is gripped
loosely and has a vertical velocity of 75 ft>s. If the coefficient
of restitution between the hammer head and the plank is
e = 0.5, determine the maximum height attained by the 50-lb
block D. The block can slide freely along the two vertical
guide rods. The plank is initially in a horizontal position.
link to diagram :
http://s3.amazonaws.com/answer-board-image/cc993076-7bbb-4ab8-936b-9788a74b8565.png
I applied the conservation of angular mom. thm, but after checking the solution manual ,
I realized that they applied the thm but adding for the whole system ,they took for the plank ,hammer, and block, m(Vg)*(distance to point B) , BUT (this is my real quistion ) ,for the plank they did , [m(Vg)*(distance to point B)] +[Ig*w] ...my quistion is why was'nt the Igw term added for the block and hammer ,and why was it added to the plank