Homework Help: Physics

Posted by June on Friday, February 5, 2010 at 6:58pm.

A rifle has a mass of 4.73 kg and it fires a bullet of mass 13.6 g at a muzzle speed of 829 m/s. What is the recoil speed of the rifle as the bullet leaves the gun barrel?

So far, I've got (using p for momentum) p=p, so massXchange in velocity of the bullet will will equal the massXchange in velocity of the rifle. So my work looks like:
.136kg x 829m/s = 4.73kg x v

Which gives me 23.8m/s, which is incorrect. What am I doing wrong?

Physics - bobpursley, Friday, February 5, 2010 at 7:07pm
For speed, it is correct. If it were asking for velocity, I would add a negative sign, meaning the opposite direction from the bullet.
Physics - June, Friday, February 5, 2010 at 7:10pm
I've tried that, but the program I'm using still says that that is incorrect.
Physics - bobpursley, Friday, February 5, 2010 at 7:16pm
The program is incorrect. Put a hex on it.
Physics - tim, Tuesday, November 9, 2010 at 10:33am
is there .136kg for 13.6g.....check that
Physics - alex, Tuesday, December 4, 2012 at 8:23pm
13.6g is 0.0136kg

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