Answer to Question #110655 in Mechanical Engineering for ahmad alahesh

Question #110655
Q15.
The ram of a pile driver has mass 800 kg and is released from rest at a
height of 2 m above the top of a 2400 kg pile. If the ram rebounds to a
height of 0.1 m after a direct central impact with the pile, determine the
following:
(a) the velocity of the pile immediately after impact;
(b) the coefficient of restitution;
(c) the percentage of the energy lost in the impact.
1
Expert's answer
2020-04-19T14:06:49-0400

Mass of Ram= 800 Kg , and mass of pile= 2400 , ram strikes to pile at height of 2m , here


initial velocity of ram at time of striking = and


and initial velocity of pile = 0 m/s and velocity of ram after impact=



Now the velocity of pile after imapct,

(a)




m/s


(b) for coefficient of restitution


e=


(c) Lost in energy = Change in kinetic energy = final kinetic energy- initail kinetic energy









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