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.

Question

anonymous · Answer

@akash123

anonymous · Answer

find out the change in momnetum

anonymous · Answer

then average force of resistance= rate of change of momentum= (change in momentum)/ (time interval)

anonymous · Answer

so 1st u have to calculate..how much time bullet will take in coming to rest?

anonymous · Answer

does it make sense?

anonymous · Answer

i guess i dont understand , sorry akash am slow in this , and i want you to help me , how to calculate change in momentum ?

anonymous · Answer

change in momentum= (final momentum- initial momentum)

anonymous · Answer

1st find accl

anonymous · Answer

i mean... 1st the bullet was moving with a speed of 150m/s then its momentum = m(150), m=20g

anonymous · Answer

yes use the formula v^2- u^2= 2as

anonymous · Answer

$$V^2 - u^2 = 2as$$

$$\frac{ 150*150*100 }{ 2*10 } = a$$

anonymous · Answer

$$F= Ma$$

anonymous · Answer

if u find the acceleration, then u can calculate the average resistance force by multiplying acceleration with mass

anonymous · Answer

Note mass shuld be in kg    1 gm = 10^-3 kg

anonymous · Answer

no need to calculate change in the momentum

anonymous · Answer

hope this helps

anonymous · Answer

According to COD ...this is maths page...and u r asking physics...Question....Plzzz...Go..to physics page

anonymous · Answer

okay let me try , @akash123 and @Yahoo! thank yu !

anonymous · Answer

am sry i din see that .. am sry !

anonymous · Answer

No...Problem.....and welcomee...

anonymous · Answer

:)