# Homework Help: Finding Momentum of a fragment after explosion

1. Jan 16, 2012

### Serendipitydo

1. The problem statement, all variables and given/known data
A small explosive device slicing to the right breaks into two pieces. The momentum of fragment 1 after the explosion is 23kg.m/s 28°RCS

What is the momentum of fragment 2 after the explosion?

2. Relevant equations
PT=PT'
P=mv
Rx= Rcos∅
Ry= Rsin∅
R= √x2+y2

3. The attempt at a solution
This is all the information given. I haven't a clue at how to even begin with this one. We generally receive minimal instruction, and we haven't done a single problem like this one. Everything else was a stationary object exploding and we were given masses and velocities and times.

Do I break it down into x and y components and find out the momentum of the grey line, then use that, combined with the 21° (331°?RCS(no clue if that's right, seeing as he went out in left field the other day with the rcs)) to get the momentum of fragment 2? That's the only thing I can think of

2. Jan 16, 2012

### humanist rho

Vertical component of momentm is also conserved.
Try to find the relation connecting sine components of the two pieces.

3. Jan 16, 2012

### genericusrnme

I was just about to ask what a feynman diagram was doing in introductory physics, then I read the question :D

it's all conservation of momentum!