- #1
nns91
- 301
- 1
Homework Statement
A 16g bullet is fired into the bob of a ballistic pendulum of mass 1.5kg When the bob is at its maximum height, the strings make an angle of 60 degree with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet.
Homework Equations
pi=pf
The Attempt at a Solution
So I think it is an inelastic collision so vf = (mbullet*vbullet) / (mbullet+mblock)
After collision:
(1/2)*(mbullet+mblock)vf2 = (mbullet+mblock)*g*h
h=2.3-2.3*cos60=1.15m
then I solved for vf2=2*9.981*1.15=22.563
the I substitute into the first formula ( I actually squared both sides to use vf^2) to find vbullet= 346.2 m/s. However it is wrong. Where did I do wrong ??