Ballistic Pendulum: Find the Bullet's Speed

AI Thread Summary
The discussion focuses on calculating the bullet's speed using a ballistic pendulum setup involving a 3.0 kg block and a 9.0 g bullet that deflects the block by 18 degrees. Participants emphasize using conservation of momentum to determine the final speed after the bullet embeds in the block. Additionally, they mention applying energy conservation principles to analyze the system's motion. The formula for the period of a pendulum, t=2*pi*sqrt(l/g), is referenced, but its relevance to finding the bullet's speed is questioned. Overall, the conversation revolves around the correct application of physics principles to solve the problem.
chawki
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Homework Statement


The ballistic pendulum is a block of 3.0 kg mass suspended from a thread 2.5 m long. A bullet with a mass of 9.0 g hits the block and sticks in it, the result being a deflection of the system by an angle of 18o.

Homework Equations


Find the bullet’s speed.

The Attempt at a Solution


all i know is t=2*pi*\sqrt{}(l/g)
 
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use conservation of momentum to find final speed

and then use energy conservation principle
 
chawki said:
all i know is t=2*pi*\sqrt{}(l/g)

This won't help!

I agree with cupid.callin
 

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