Confirm Calculation of Bullet Velocity to Hit Skeet

AI Thread Summary
To hit a skeet moving at 25.0 m/s, the bullet must travel the same distance as the skeet in the time it takes to reach it. The rifleman shoots 2 seconds after the skeet is fired, and it takes 0.4 seconds for the bullet to hit the target. The initial velocity needed for the bullet is calculated to be around 191 m/s, but some participants suggest this figure may be too high. The problem is considered one-dimensional, although the angle of the skeet's trajectory raises questions about the accuracy of the calculations. The consensus leans towards a smaller required bullet velocity.
AaronL
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A skeet is shot at 25.0 m/s [H 75 U], 2 seconds later the rifleman shoots, striking the target in .4s. What initial velocty of the bullet is needed for it to hit the skeet?

I just need somone to confirm the answer I have. It's probably way off but I got 191 m/s [H 78 U]


thanks.
 
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The bullet must travel the same distance as the skeet does.
The speed I got was a bit smaller.
 
Is this a one dimensional problem or what? Skeet are fired at an angle...

The numbers sound about right for... roughly 350 mph is an ok bullet speed (kinda on the lower end however)
 
Pengwuino said:
Is this a one dimensional problem or what? Skeet are fired at an angle...
I assumed it is one dimensional. If it isn't, my help is of course incorrect.
 
answer is smaller
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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