Average Force

  • Thread starter ny_aish
  • Start date
  • #1
21
0
A 22 g bullet is fired from a rifle. It takes 2.55 10^-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 730 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet

m=22g
is a=0 ? since its constant
v = 730 m/s
t=2.55 * 10^-3
I thought this is F=ma.

But its wrong! I believe im doing this wrong, any suggestions???
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
6,230
31
You can use the kinematic equations to find the acceleration. The initial velocity is zero. Hence you have the following, initial velocity, final velocity and the time, and you need to get the acceleration.

Can you find one equation that incorporates all of these terms?
 
  • #3
21
0
hmmmmmm....let me give it a shot
 
  • #4
21
0
my method was right but I needed to convert Grams to Kg, Thanks though!
 
  • #5
rock.freak667
Homework Helper
6,230
31
my method was right but I needed to convert Grams to Kg, Thanks though!

Yes but acceleration was not zero, had it been zero, then the resultant force would be zero as well.
 
  • #6
21
0
yesssss!!!! thats right tooo, for Acceleration i used Delta V/Delta T. Thanks :)
 

Related Threads on Average Force

  • Last Post
Replies
2
Views
7K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
12
Views
4K
  • Last Post
Replies
1
Views
804
  • Last Post
Replies
7
Views
2K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
1
Views
4K
Replies
4
Views
2K
Top