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.

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.

Expert's answer

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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