A pile driver of mass 300 kg used to drive a pile of 500 kg verticaly into the ground. the pile driver free falls through a distance of 54.0m, rebounding with a velocity relative to the pile and equal to the relative velocity immediately before the impact. detirmine velocity of driver immediately before impact
Answers
Answer:
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Answer:
The average resistance of the ground is 28.521 kN.
Explanation:
Given- A pile driver hammer of mass 140 kg falls freely through a distance of 4.5 m to strike a pile of mass 390 kg and drives it 70 mm into the ground. The hammer does not rebound when driving the pile. Determine the average resistance of the ground.
answer is solved in picture
In comparing the two methods, it might be concluded that in this particular case there is very little to choose between them. Both methods required use of the principle of conservation of momentum to determine the value of velocity immediately after impact of the hammer. Both methods return identical answers with the same degree of accuracy.
We see that the kinetic energy of the system at impact is not conserved.
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