Cannon Question: Loose Cannon Velocity

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SUMMARY

The discussion centers on the physics problem involving a cannon of mass 5.80 x 103 kg that fires an 85.0-kg shell at an initial velocity of +551 m/s. When the cannon is rigidly bolted to the Earth, the shell's kinetic energy is imparted without recoil. However, when the cannon is unbolted, conservation of momentum and energy principles dictate that the velocity of the shell fired from the loose cannon can be calculated using the same kinetic energy imparted to the system. The solution requires applying both conservation laws to determine the new velocity of the shell.

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Homework Statement


A cannon of mass 5.80 x 10^3 kg is rigidly bolted to the Earth so it can recoil only by a negligible amount. The cannon fires an 85.0-kg shell horizontally with an initial velocity of +551 m/s. Suppose the cannon is then unbolted from the Earth and no external force hinders its recoil. What would be the velocity of a shell fired by this loose cannon? (Hint: In both cases assume that the burning gunpowder imparts the same kinetic energy to the system.)


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The Attempt at a Solution

 
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Two conservation laws apply here. One of them is already implicitly mentioned in the hint. The other one has to do with the masses and velocities.
 

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