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Which has more momentum a train at rest or a bullet fired from a gun?
Wiki User
∙ 12y ago
A bullet fired from a gun
Wiki User
∙ 12y ago
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A car and a train are traveling with the same velocitydo the two objects have the same momentum?
No, the train has MUCH more mass and momentum is mass times speed.
Why does a bullet have less momentum fired from a short barrel vs long barrel?
At the instant the gun fires, the bullet is at rest- speed zero. As the expanding gasses from the burning gunpowder reach the bullet, they begin pushing the bullet up the barrel. It's speed is increasing- and the longer the push, the higher the speed. There IS a point of diminishing returns- where a barrel LONGER than the perfect length begins to slow the bullet- you have used all the expanding gasses, and now friction is slowing the bullet. If you had a barrel 20 ft long, the bullet would not make it all the way up the barrel, it would stop.For barrels on any realistically-usable weapon, a longer barrel will provide more momentum to the bullet than a shorter one. In addition, longer rifled barrels will also impart more spin, which will increase accuracy.
Why does a gunner feel a backward jerk when firing a gun?
This is conservation of momentum. You have the hot gases from the explosive charge along with the bullet moving out the barrel, away from the person. Momentum is mass times velocity. While the mass of the bullet and gases are small, the velocity is very high. So nothing was moving before the trigger was pulled, so net momentum is zero. After the trigger is pulled, the momentum is still net zero. Any momentum away from the gunner will have an equal momentum (the gun recoiling) toward him. Since the gun has much more mass than the bullet, the velocity is much less.
Which should be the best on knocking the bear down- a rubber bullet or a lead bullet with the same momentum explain?
If we consider the bullets of same size,then rubber bullet having less density will have higher velocity and higher kinetic energy than that of lead bullet.Thus rubber bullet can impart more energy.Hence this would be more effective.
What is an example of an object with a small mass that has a large momentum?
That would depend on what you consider "large".The size of an object's momentum = (its mass) x (its speed).So, more mass and more speed result in more momentum.
Which has more momentum a gun or the bullet it fires?
If the gun is stationary before the shot, then the momentum of the gun and the momentum of the bullet are equal and opposite after the shot.
What has more momentum an elephant walking or a bullet?
The elephant
What is the width of a bullet train?
More or less whatever the manufacturer wants it to be. If you're asking about a particular bullet train, you'll have to be more specific.
Does a tiny bullet have more momentum than a huge truck?
It depends on how fast each is going and how much each weighs. Momentum is calculated by multiplying the mass of an object by its speed. A tiny bullet moving very fast can have more momentum than a huge truck if the truck is moving very slowly (or not at all). (bullet mass) X (bullet speed) > (truck mass) X (truck speed)
A car and a train are traveling with the same velocitydo the two objects have the same momentum?
No, the train has MUCH more mass and momentum is mass times speed.
Does a bullet train hold more passengers than a passenger train?
No, as it has less passenger seats
Does a train going 30 mph have more momentum than a car going 35 mph?
Yes. momentum is figured out by the formula p =mv momentum = mass (weight) x velocity The train would have a massive amount of mass and as you can see in the formula the car (mass) would not be anywhere close to the momentum of the train.
Why it is easier to start or to stop a car than train?
It's all about momentum, which is the product of mass times velocity. The more momentum an object has the harder it is to stop it. Even a slow moving train has a lot of momentum because its mass is so huge. A fired bullet has a lot of momentum, too, because although its mass is small its velocity is extremely high.I recently thought of a great way to demonstrate the effect that extra mass has on stopping an object. Hold up a fly swatter and, moving only your wrist, wave it from side to side or back and forth very quickly. Now do the same with a hammer. It's much easier to reverse the direction of the fly swatter because its mass is so very low.
What is the principle that bullet train work on?
The principle with which the bullet train works is the Magnetic Levitation. U can see the following link to know more about it. http://science.howstuffworks.com/maglev-train.htm
If you fired a gun in space would you accelerate in the opposite direction at the same speed as the bullet?
No. Assuming you have a gun that can fire in space, you would travel in the opposite direction, conserving momentum, but because you are more massive than the bullet, your speed in the opposite direction would be less. Momentum is mass*velocity, so your speed should be less than the bullet's by the same factor as the ratio of the bullet's mass to your own. You would also start rotating unless your shot was perfectly aligned with your center of mass.If that's not convincing, consider what happens if you shoot a bullet straight into the air. Does the earth move in the opposite direction at the same speed?
Why does a bullet have less momentum fired from a short barrel vs long barrel?
At the instant the gun fires, the bullet is at rest- speed zero. As the expanding gasses from the burning gunpowder reach the bullet, they begin pushing the bullet up the barrel. It's speed is increasing- and the longer the push, the higher the speed. There IS a point of diminishing returns- where a barrel LONGER than the perfect length begins to slow the bullet- you have used all the expanding gasses, and now friction is slowing the bullet. If you had a barrel 20 ft long, the bullet would not make it all the way up the barrel, it would stop.For barrels on any realistically-usable weapon, a longer barrel will provide more momentum to the bullet than a shorter one. In addition, longer rifled barrels will also impart more spin, which will increase accuracy.
How many passengers can a bullet train hold?
more than 50
