Speed of a bullet.
Author:
rose
01 6th, 2009 in
xn--9ou.com
edit
A bullet with a mass of 6.00 g is fired through a 1.25 kg block of
wood on a frictionless surface. The initial speed of the bullet is 896
m/s, and the speed of the bullet after it exits the block is 435 m/s.
At what speed does the block move after the bullet passes through it?First step convert masses to equivalents.
i.e. 6g bullet becomes 0.06kg
Now momentum p=mv where p = momentum m = mass v = velocity
There will be conservation of momentum pre and post interaction.
Therefore
p(bullet before interaction) = 0.06*896
= 53.76
So
53.76 = p(bullet post interaction) + p (block post interaction)
53.76 = (0.06*435) + 1.25v
v = 22.128 m/s
v = 22.1 m/s to 3 s.f.Seems like a question from school assignment, so just a hint.
Apply conservation of linear momentum.
Initial momentum of bullet = sum of final momentums of block and bullet#If you have any other info about this subject , Please add it free.# |
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