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ashna
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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.
 2 years ago
 2 years ago
ashna Group Title
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.
 2 years ago
 2 years ago

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akash123 Group TitleBest ResponseYou've already chosen the best response.1
find out the change in momnetum
 2 years ago

akash123 Group TitleBest ResponseYou've already chosen the best response.1
then average force of resistance= rate of change of momentum= (change in momentum)/ (time interval)
 2 years ago

akash123 Group TitleBest ResponseYou've already chosen the best response.1
so 1st u have to calculate..how much time bullet will take in coming to rest?
 2 years ago

akash123 Group TitleBest ResponseYou've already chosen the best response.1
does it make sense?
 2 years ago

ashna Group TitleBest ResponseYou'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 ?
 2 years ago

akash123 Group TitleBest ResponseYou've already chosen the best response.1
change in momentum= (final momentum initial momentum)
 2 years ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.0
1st find accl
 2 years ago

akash123 Group TitleBest ResponseYou'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
 2 years ago

akash123 Group TitleBest ResponseYou've already chosen the best response.1
yes use the formula v^2 u^2= 2as
 2 years ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.0
\[V^2  u^2 = 2as\] \[\frac{ 150*150*100 }{ 2*10 } = a\]
 2 years ago

akash123 Group TitleBest ResponseYou'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
 2 years ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.0
Note mass shuld be in kg 1 gm = 10^3 kg
 2 years ago

akash123 Group TitleBest ResponseYou've already chosen the best response.1
no need to calculate change in the momentum
 2 years ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.0
hope this helps
 2 years ago

Yahoo! Group TitleBest ResponseYou'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
 2 years ago

ashna Group TitleBest ResponseYou've already chosen the best response.0
okay let me try , @akash123 and @Yahoo! thank yu !
 2 years ago

ashna Group TitleBest ResponseYou've already chosen the best response.0
am sry i din see that .. am sry !
 2 years ago

Yahoo! Group TitleBest ResponseYou've already chosen the best response.0
No...Problem.....and welcomee...
 2 years ago
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