1. Linear Momentum

The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig.

As she fires a gun, she is driven back over the edge and into the sea.

Suppose the mass of a bullet is 0.005 kg, and its velocity is +719 m/s.

Her mass (including the gun) is 48 kg.

(a) What recoil velocity does she acquire in response to a single shot from a stationary position, assuming that no external force keeps her in place?
in m/s

(b) Under the same assumption, what would be her recoil velocity if, instead, she shoots a blank cartridge that ejects a mass of 5.0 10-4 kg at a velocity of +719 m/s?
in m/s

i believe it may be necessary for me to find the forces first, and use an equation involved with the principle of Linear Momementum?

2. Originally Posted by rcmango
The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig.

As she fires a gun, she is driven back over the edge and into the sea.

Suppose the mass of a bullet is 0.005 kg, and its velocity is +719 m/s.

Her mass (including the gun) is 48 kg.

(a) What recoil velocity does she acquire in response to a single shot from a stationary position, assuming that no external force keeps her in place?
in m/s

(b) Under the same assumption, what would be her recoil velocity if, instead, she shoots a blank cartridge that ejects a mass of 5.0 10-4 kg at a velocity of +719 m/s?
in m/s

i believe it may be necessary for me to find the forces first, and use an equation involved with the principle of Linear Momementum?
Give this one another "shot" ( ) after you have looked at my response to the "skater" post. If you still have a question on this one after that, I'll walk you through this. (Though if you don't log on tonight, you may have to wait until Friday to get a response from me.)

-Dan

3. okay, I believe its a conservation of momentum theorem.

such that vf2 = (-m1 * vf1) / m2

which was -0.005 kg * 719 m/s then divided by 48 kg. which gave me -.074 m/s

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and the second with the new mass, is -7.5 x 10^-3

thanks.