- #1

bchat112000

- 6

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i know that the equation is p=mv (vector based)

0.173*v =27.5N so how do i find velocity...

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- Thread starter bchat112000
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- #1

bchat112000

- 6

- 0

i know that the equation is p=mv (vector based)

0.173*v =27.5N so how do i find velocity...

- #2

NascentOxygen

Staff Emeritus

Science Advisor

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Hi bchat112000. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif [Broken]A model rocket is constructed with a motor that can provide a total impulse of 27.5 N · s. The mass of the rocket is 0.173 kg. What is the speed that this rocket achieves when launched from rest? Neglect the effects of gravity and air resistance.

0.173*v =27.5N so how do i find velocity...

0.173 *

That's one equation with one unknown. Are you able to isolate that

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- #3

bchat112000

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yes by multiplying by both sides???

- #4

bchat112000

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I love this forum by the way, thx for helping people

- #5

NascentOxygen

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What is your final answer for velocity?

- #6

bchat112000

- 6

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i got 4.75

0.173 times 27.5n

0.173 times 27.5n

- #7

bchat112000

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0+27.5=0.173 This is the formula

27.5Ns/0.173kg=159

- #8

NascentOxygen

Staff Emeritus

Science Advisor

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An equals sign requires what is on one side to equal what is on the other.ok i plugged the formula ..initial v is 0 final v is 27.5 the mass is 0.173

0+27.5=0.173

That looks better.This is the formula

27.5Ns/0.173kg=159

Speed requires both a magnitude and units

The correct answer is 159 m/sec

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