(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A firecracker in a coconut blows the coconut into three pieces. Two pieces of equal mass fly off south and west, perpendicular to each other, at 20m/s. The third piece has twice the mass as the other two.

2. Relevant equations

p=mv

pi=pf

3. The attempt at a solution

My attempt involved giving the variable m to the two equal pieces and 2m to the third piece. I gave a value to m. Also the momentum before and after is equal to zero so I worked out the momentum and re arranged the equation to solve for v. I got 20m/s but i was wrong.

1. The problem statement, all variables and given/known data

Far in space, where gravity is negligible, a 495 kg rocket traveling at 95.0 m/s fires its engines. The figure View Figure shows the thrust force as a function of time. The mass lost by the rocket during these 30 s is negligible.

http://img212.imageshack.us/img212/8301/knightfigure0926xe8.th.jpg [Broken]

1)What impulse does the engine impart to the rocket?

2)At what time does the rocket reach its maximum speed?

3)What is the maximum speed of the rocket?

2. Relevant equations

Impulse= (Force)(Change in Time)

3. The attempt at a solution

Um I tried finding the area under the graph to find the impulse but that didn't work. I'm really having a hard time trying to read the graph.

Any tips for a struggling student? :S

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# Homework Help: Momentum/Impulse Question

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