(a)a bullet fired from a rifle.
(b)a football quater back runing at top speed
(c)a horse walking at about 2 miles/hour
(d)an elephant standing still
2006-12-26 20:50:51 · 20 answers · asked by good friend 1 in Science & Mathematics ➔ Physics
Roy did the best job of trying to analyse, but made some strange choices for data.
a. Rifle: choices there probably OK. There's probably a rifle that has that data. So p=10Kg-m/Sec
b. Quarterback: 25Kg? No, try 100Kg. And at Roy's speed, the QB could cover the 100 yards in under 2 sec! More reasonable: 10 m/s. So p=1000Kg-m/s.
c. Horse: 100 Kg? For the Belgian Draft Horse, 1000 Kg for a round number. Speed: 2 mph is about 1 m/s. So p=1000Kg-m/s.
d. Elephant: I agree, 0 momentum.
So the winner ... the QB and horse tie. And honest, I chose the numbers honestly not to make it come out a tie. The Belgian Draft Horse is a beast. A lighter horse at 2mph would have come out with less momentum than the QB.
2006-12-27 08:29:21 · answer #1 · answered by sojsail 7 · 0⤊ 0⤋
Got to go with the bullet because it has been put into a high speed from the fact it has been propelled by an explosion. The quarterback may be bigger but he would not penetrate a Blosk of concrete (the bullet will but it still stops after leaving its mark). The horse at 2 miles an hour is certainly not going to penetrate the concrete ,and that elephant has no momentum as it is not moving.
2006-12-27 06:05:59 · answer #2 · answered by George G 5 · 0⤊ 0⤋
A bullet fired from a rifle will have maximum velocity than any other case ,though mass is also an important aspect with the greater velocity only a bullet can have larger momentum.
2006-12-31 01:34:06 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Mathematically it is probably B, because momentum is mass times velocity and that seems like it might have the highest combination of the two. But, I think the answer your looking for is D, because momentum is also described as an objects resistance to change and the elephant has a significantly higher resistance to change in velocity compared to the others. So I think the answer your looking for is D.
2006-12-27 04:58:52 · answer #4 · answered by joe h 2 · 0⤊ 0⤋
Imagine attaching a rope to a, b, c and d and having it pull something, which would do best? Not the bullet, not Mr. lazy elephant, and I do believe that horse would do better than the QB.
I choose C
2006-12-27 09:56:04 · answer #5 · answered by Pfo 7 · 0⤊ 0⤋
(a)
Although the bullet has a small mass, but it has a large velocity
and
momentum = mass X velocity
elephant has no momentum, because it standing still, no velocity so no momentum
Inertial mass is the resistance of the body to change its velocity
not the momentum
2006-12-27 05:59:12 · answer #6 · answered by ray2_moot 2 · 0⤊ 0⤋
It is bullet because we know that p=mv momentum is higher if mass or velocity or both are larger hence bullet will have large velocity when it is fired
2006-12-27 04:58:31 · answer #7 · answered by Ankur 1 · 0⤊ 0⤋
it's (C)
Because momentum = mass X velocity
now for option (D) the velocity is 0 therefore it's momentum is 0
and for (A) and (B) the masses are too small
thus for a horse its mass much greater than the others therefore it has the largest momentum amongst these
2006-12-27 05:50:48 · answer #8 · answered by KAUSH 2 · 0⤊ 0⤋
We can't really answer this question without knowing what speed the individual items are going in (a) and (b) or the mass in (c) and (d).
If you want to conjecture, then it certainly hits intuitively that the answer SHOULD be (a). But without more information, it's impossible to answer.
2006-12-27 17:03:44 · answer #9 · answered by Kenneth M 1 · 0⤊ 0⤋
The elephant is really not standing completely still. D.
2006-12-27 05:38:33 · answer #10 · answered by sassychickensuckerboy 4 · 0⤊ 0⤋