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Ballistic Pendulum — Part II
Previously, we used a ballistic pendulum to measure the initial velocity of a projectile (steel ball) fired
from a springloaded gun. Now we’ll test that result by predicting and then measuring the range of a ball
fired from the gun.
Equipment.
Ballistic pendulum device.
Make sure you use the same device that you used in Part I
. Rule. Target
box, carbon paper.
Theory
First make your prediction for
L
, given the muzzle velocity
v
0
you determined earlier, using the ballistic
pendulum. You should also work out a formula for the uncertainty in
L
.
1.
Use your knowledge of projectile motion to find an equation for
L
in terms of (
H+h
), the initial
height of the ball above the floor and the muzzle velocity
v
0
.
2.
Given estimated uncertainties
Δ
H
,
Δ
h
and
Δ
v
0
, find an equation for the uncertainty in
L
.
When you have done this, have your work checked.
If it looks good, you can go ahead and set up
your equipment.
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 Fall '09
 LIND
 ΔH, ballistic pendulum

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