ashna
A bullet of mass 20g moving with a speed of 150m/s atrikes a block and comes to rest after piercing 10cm into it . Find the avg. force of resistance offered by the block.
Delete
Share
This Question is Closed
ashna
Best Response
You've already chosen the best response.
0
@akash123
akash123
Best Response
You've already chosen the best response.
1
find out the change in momnetum
akash123
Best Response
You've already chosen the best response.
1
then average force of resistance= rate of change of momentum= (change in momentum)/ (time interval)
akash123
Best Response
You've already chosen the best response.
1
so 1st u have to calculate..how much time bullet will take in coming to rest?
akash123
Best Response
You've already chosen the best response.
1
does it make sense?
ashna
Best Response
You've already chosen the best response.
0
i guess i dont understand , sorry akash am slow in this , and i want you to help me , how to calculate change in momentum ?
akash123
Best Response
You've already chosen the best response.
1
change in momentum= (final momentum- initial momentum)
Yahoo!
Best Response
You've already chosen the best response.
0
1st find accl
akash123
Best Response
You've already chosen the best response.
1
i mean... 1st the bullet was moving with a speed of 150m/s then its momentum = m(150), m=20g
akash123
Best Response
You've already chosen the best response.
1
yes use the formula v^2- u^2= 2as
Yahoo!
Best Response
You've already chosen the best response.
0
\[V^2 - u^2 = 2as\]
\[\frac{ 150*150*100 }{ 2*10 } = a\]
Yahoo!
Best Response
You've already chosen the best response.
0
\[F= Ma\]
akash123
Best Response
You've already chosen the best response.
1
if u find the acceleration, then u can calculate the average resistance force by multiplying acceleration with mass
Yahoo!
Best Response
You've already chosen the best response.
0
Note mass shuld be in kg 1 gm = 10^-3 kg
akash123
Best Response
You've already chosen the best response.
1
no need to calculate change in the momentum
Yahoo!
Best Response
You've already chosen the best response.
0
hope this helps
Yahoo!
Best Response
You've already chosen the best response.
0
According to COD ...this is maths page...and u r asking physics...Question....Plzzz...Go..to physics page
ashna
Best Response
You've already chosen the best response.
0
okay let me try , @akash123 and @Yahoo! thank yu !
ashna
Best Response
You've already chosen the best response.
0
am sry i din see that .. am sry !
Yahoo!
Best Response
You've already chosen the best response.
0
No...Problem.....and welcomee...
akash123
Best Response
You've already chosen the best response.
1
:)