Ballistic pendulum: 25 g bullet at 300 m/s into 98 N block

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acissej_o3
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a 25-gm bullet traveling with a speed of 300m/sec strikes the block of a ballistic pendulum. the block weighs 98N and is supported by a light cord 1 m long. calculate the length of the arc through which the pendulum swings.
 
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Welcome to PF!

acissej_o3 said:
a 25-gm bullet traveling with a speed of 300m/sec strikes the block of a ballistic pendulum. the block weighs 98N and is supported by a light cord 1 m long. calculate the length of the arc through which the pendulum swings.

Hi acissej_o3! Welcome to PF! :smile:

Hint: the bullet will be embedded in the block, so they will move together.

Use conservation of momentum to find the initial velocity, and then use conservation of energy to find the height! :smile:
 


tiny-tim said:
Hi acissej_o3! Welcome to PF! :smile:

Hint: the bullet will be embedded in the block, so they will move together.

Use conservation of momentum to find the initial velocity, and then use conservation of energy to find the height! :smile:

i have computed for the height. i don't know how to compute for the arc... tnx for replying:)
 
acissej_o3 said:
i have computed for the height. i don't know how to compute for the arc...

easy-peasy! :smile:

the block moves on a circle of radius 1m …

so the cos of the angle is … ? :wink:
 
tiny-tim said:
easy-peasy! :smile:

the block moves on a circle of radius 1m …

so the cos of the angle is … ? :wink:

y is it zero?
 
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