- #1
Draco
- 30
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Homework Statement
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.
Homework Equations
p=mv
pi=pf
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.
Homework Statement
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?
Homework Equations
Impulse= (Force)(Change in Time)
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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