Asked by joey
A bullet of mass 8 g strikes a ballistic pendulum of mass 2.0 kg. The center of mass of the pendulum rises a vertical distance of 10 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.
Answers
Answered by
bobpursley
The momentum of the bullet: massbullet*velocity
that has to equal the momentum of the block and bullet combination at impact(mblock+massbullet)V set them equal, and solve for V.
Now, the initialKE of the block and bullet combination is 1/2 (totalmass)V^2
set that equal to the change in PEnergy
totalmass*g*height.
solve for height in terms of initial bullet velocity.
WEll, you know height, so you can solve for bullet velocity.
that has to equal the momentum of the block and bullet combination at impact(mblock+massbullet)V set them equal, and solve for V.
Now, the initialKE of the block and bullet combination is 1/2 (totalmass)V^2
set that equal to the change in PEnergy
totalmass*g*height.
solve for height in terms of initial bullet velocity.
WEll, you know height, so you can solve for bullet velocity.
Answered by
Anonymous
12