- #1
Hypnos_16
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Homework Statement
A 47.00 g bullet hits and becomes embedded in a 5.10 kg wooden block which is hanging from a 2.50 m long string. This causes the block to swing through an arc of 23.50o. What was the speed of the bullet before it hit the block?
mb = 0.047kg
mw = 510kg
r = 2.50
theta = 23.5 degrees
Homework Equations
using the radius and theta i imagine to figure out that when the block is shot it swings back 1.09m
i did this by using Tan(23.5) = Opp / 2.50
however when i tried using mv + mv = ∑mv i couldn't get an answer since i don't know any speeds
The Attempt at a Solution
mv + mv = mv
(0.047)v + 5.10(0) = 5.147(v)
0.047v = 5.147v
i don't know the second v cause i don't know how fast the block moved when it was shot.
Help?