Hi,
Please can I have some help with this problem:
A machine gun in automatic mode fires 20g bullets with vbullet=300m/s at 60 bullets/second.
a- If the bullets enters a thick wooden wall, what is the average force exerted against the wall?
b- If the bullets hit a steel wall and rebound elastically,what is the average force on the wall?
What i did is
for a:
I computed the impulse: I= pf-pi= m*v-( 0)=6 N.s
to calculate the average force: I/(time for one bullet to be fired)= 6/(1/60)=360N
Am I right?
However I have no idea for the second question??
B.
Please can I have some help with this problem:
A machine gun in automatic mode fires 20g bullets with vbullet=300m/s at 60 bullets/second.
a- If the bullets enters a thick wooden wall, what is the average force exerted against the wall?
b- If the bullets hit a steel wall and rebound elastically,what is the average force on the wall?
What i did is
for a:
I computed the impulse: I= pf-pi= m*v-( 0)=6 N.s
to calculate the average force: I/(time for one bullet to be fired)= 6/(1/60)=360N
Am I right?
However I have no idea for the second question??
B.