Expanding gases leaving a muzzle

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The discussion focuses on calculating the momentum of expanding gases from a rifle muzzle, which contributes to the recoil effect. Given a .30 caliber bullet with a mass of 0.0072 kg and a speed of 601 m/s, along with a rifle mass of 2.8 kg recoiling at 1.85 m/s, the problem requires determining the gases' momentum in relation to the Earth. Participants are encouraged to engage with the problem and share their attempts or solutions. The interaction emphasizes understanding the physics behind momentum and recoil in firearms. This analysis highlights the relationship between bullet dynamics and the resulting forces acting on the rifle.
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Homework Statement


The expanding gases that leave the muzzle of a rifle also contribute to the recoil. A .30 caliber bullet has mass 0.0072kg and a speed 0f 601 m/s relative to the muzzle when fired from a rifle that has mass 2.8 kg. The loosely held rifle recoils at a speed of 1.85 m/s relative to the earth. Find the momentum of the propellant gases in a coordinate system attached to the Earth as they leave the muzzle of the rifle.
 
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