# Tag Info

### Calculate the speed of a rifle bullet as a result of shooting a bullet, should we use momentum or kinetic energy?

Momentum is always conserved. Kinetic Energy is not. But more importantly, how did you use energy conservation in this problem? The initial kinetic energy is 0, so then the final kinetic energy would ...

### How do rifled-bore shells remain pointing into the airflow?

If the shell keeps pointing in the same direction as the trajectory curves downward from that direction, the air will be hiting the shell from below. The effective total force acts a point called ...
1 vote

### Calculate the speed of a rifle bullet as a result of shooting a bullet, should we use momentum or kinetic energy?

... should we use momentum or kinetic energy ? Use conservation of momentum. Although the energy released from the gunpowder in the bullet's cartridge gives kinetic energy to both the bullet and the ...
1 vote

### Calculate the speed of a rifle bullet as a result of shooting a bullet, should we use momentum or kinetic energy?

Energy conservation law could go in this task like this : $$\eta~\Phi ~m_{~\text{powder}} = K_B + K_R \tag 1$$ $\Phi$ is gunpowder energy release rate which is about $3~\text{kJ/g}$ (this depends on ...

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