Question

the machine gun fires 25 gram bullets at the rate of 600 bullets per minute with a speed of 200m/s. calculate the force requred to keep the gun in position.

Answer 1

plzz do....

Answer 2

.025*600*60*200

Answer 3

force is the rate of change of momentum

Answer 4

does the number of bullets being shot being taken into account? why not just use 25g?

Answer 5

is the ans is 5000N??

Answer 6

yea number of bullets shud be considered

Answer 7

means the ans is 5000N ??

Answer 8

????????????

Answer 9

calculate it.......is the ans 5000?

Answer 10

but F = (mVf - mVi) / t ...the initial velocity is 0??

Answer 11

yea

Answer 12

is the ans is right?

Answer 13

i think it's 180000 !!!

Answer 14

haha! I got that too.

Answer 15

isnt it was 5000
as, (mass/time)* velocity??

Answer 16

F = ma

Answer 17

well do it this way calculate impluse
it is mdv
I=F dt
u l get dt.....

Answer 18

didn't get u !!

Answer 19

but in this case, it's related to momentum.

Answer 20

yea....so?
u need force r8
um @kulveen do u kno wat impulse is?

Answer 21

yaa bt f is the rate of change of momentum!!

Answer 22

ok...calculate the rate of change..............
mdv/dt...........

Answer 23

oh, I was saying it's easier to use momentum to find rather than F=ma, after your explanation..

Answer 24

:/

Answer 25

no i dont meaning of impulse... :P

Answer 26

how about momentum?

Answer 27

fine then do it this way..........for a single bullet the change of momentum is mdv.......
nd dt wud be 1/600/60..................

Answer 28

wait....

Answer 29

cant we do in this way- Force is the rate of change of momentum = (mass/time)*velocity

Answer 30

ok....u can

Answer 31

can u do it in this way and tl me the ans?

Answer 32

wat's
m/t = -25/(1/600/60)
nd v = 200

Answer 33

uh, I got 50N.

Answer 34

that's 0.025

Answer 35

no u wud be in KN...........it wont be that less

Answer 36

is this the rght ans?? 0.025??

Answer 37

noo lol
ans is 180KN

Answer 38

tl me the right ans....

Answer 39

u got options?

Answer 40

I agree....because you don't have the exact time...if you use F =mass/time *velocity it will be inaccurate in my opinion, sorry! I forgot about the conversion :P
anwer : 180kN

Answer 41

noooo

Answer 42

ans is 180KN

Answer 43

can u do it? here

Answer 44

it did it r8..........

Answer 45

means thoroly can u do it heree??

Answer 46

.025*600*60*200 :/