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Bullet passing through block of wood. Find max height of the wood.

  • Thread starter demenius
  • Start date
  • #1
10
0

Homework Statement


A bullet of mass 0.005kg is shot at a suspended block of wood with mass 1kg. The bullet initially has a speed of 200m/s, and passes through the block of wood. The bullet passes through the wood, and 50J of work is done deforming the shape of the bullet and block. If the block is suspended from a very long string, what is the maximum height to which it will rise?

http://imageshack.us/photo/my-images/266/bulletblock.png/"

Homework Equations


None given.


The Attempt at a Solution


I tried solving it using momentum before and after. But there is no mass given for the block and I do not know what to do with the 50J of work.
 
Last edited by a moderator:

Answers and Replies

  • #2
PeterO
Homework Helper
2,425
46

Homework Statement


A bullet of mass 0.005kg is shot at a suspended block of wood with mass 1kg. The bullet initially has a speed of 200m/s, and passes through the block of wood. The bullet passes through the wood, and 50J of work is done deforming the shape of the bullet and block. If the block is suspended from a very long string, what is the maximum height to which it will rise?

http://imageshack.us/photo/my-images/266/bulletblock.png/"

Homework Equations


None given.


The Attempt at a Solution


I tried solving it using momentum before and after. But there is no mass given for the block and I do not know what to do with the 50J of work.
In red
 
Last edited by a moderator:
  • #3
10
0
I cannot believe I did not see that. :S. Thank you.
 
  • #4
10
0
So would the height be equal to (v*mb/(mb+mw))^2 * 1/2g?

So. (200*0.005/(0.005+1))^2 *1/2(9.81) = 0.05m?
 

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