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Edwardo_Elric
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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 a mass of 0.00720kg and a speed of 601 m/s relative to the muzzle when fired from a rifle that has a mass of 2.50kg. The loosely held rifle recoils at a speed of 1.85m/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.
Homework Equations
If the external forces is zero The Total momentum of the system is constant:
P = p_{A} + p_{B} ...
The Attempt at a Solution
i just used the formula:
R = rifle; B = bullet
Px = mRVR + mBVB
Px = (2.50kg)(-1.85m/s) + (0.00720kg)(601m/s)
Px = -0.2978kg m/s