Sorry to say but this is an Norwegian Leopard 2 battle tank of the Telemark Battalion during the joint NATO military exercise Cold Response 2009. The picture was taken near Alapmoen, Norway.
@Rusty- You are not understanding acceleration correctly, because you have not included time. Acceleration is not simply a change in velocity, it is a change in velocity per time. Using your example, the greater change in velocity associated with an airliner is survivable because this change in velocity is over a longer course of time, and as a result has a lower acceleration. When hit by a truck, the change in velocity is quite rapid, and is a large acceleration. As you may have learned in a physics class, Force = Mass x Acceleration. Assuming your body has a constant mass in your example, a larger acceleration experienced in the truck impact results in (or is caused by, depending on your point of view) a larger force on the body.Finally, you also seem to confuse force with pressure. A force exerted over an area is referred to as pressure. Lets use an example: in order to accelerate a ball, a force is required. By multiplying the mass of the ball times the acceleration desired this force may be calculated. However, to determine the effects on the material of the ball (or the deadly effects on a human body as in your example), we must calculate the pressure. Using our force which we recently calculated, we can divide this force by the area to determine the pressure. You are correct in your description of fluids as being able to lower the damage from an impact, but this is because they distribute the force more evenly over a larger area, reducing the pressure experienced by any single part of your body and thus reducing damage.To sum up: an acceleration is the change in velocity divided by time. In order to accelerate an object, a force is required to be imparted on that object. Dividing this force by area over which it is exerted will yield the pressure. Pressure is what causes damage to materials, and fluids may be used to distribute force evenly over larger areas thus reducing pressure.Oh, and to address your example about not being killed by being stopped while walking 2 miles per hour. This could in fact easily kill someone, provided the time of impact is small enough. To use a second example, think of a car travelling 70 mph on the highway. Using the brakes to come to a stop over a time of 4 seconds is safe, but coming to a stop in a tenth of a second by slamming into a brick wall is not safe. Time here is equally as important as total change in velocity is.
sierraechoAug 15, 2009
This account has been closed by the user
horreeAug 16, 2009
Sorry to say but this is an Norwegian Leopard 2 battle tank of the Telemark Battalion during the joint NATO military exercise Cold Response 2009. The picture was taken near Alapmoen, Norway.
imkidredAug 17, 2009
Catch me if you can tank drivin' mutha f**ka!!
tehcrsAug 18, 2009
No matter where it is, it's the first thing that made me laugh for today. Dugg!
polycarp87Aug 20, 2009
@Rusty- You are not understanding acceleration correctly, because you have not included time. Acceleration is not simply a change in velocity, it is a change in velocity per time. Using your example, the greater change in velocity associated with an airliner is survivable because this change in velocity is over a longer course of time, and as a result has a lower acceleration. When hit by a truck, the change in velocity is quite rapid, and is a large acceleration. As you may have learned in a physics class, Force = Mass x Acceleration. Assuming your body has a constant mass in your example, a larger acceleration experienced in the truck impact results in (or is caused by, depending on your point of view) a larger force on the body.Finally, you also seem to confuse force with pressure. A force exerted over an area is referred to as pressure. Lets use an example: in order to accelerate a ball, a force is required. By multiplying the mass of the ball times the acceleration desired this force may be calculated. However, to determine the effects on the material of the ball (or the deadly effects on a human body as in your example), we must calculate the pressure. Using our force which we recently calculated, we can divide this force by the area to determine the pressure. You are correct in your description of fluids as being able to lower the damage from an impact, but this is because they distribute the force more evenly over a larger area, reducing the pressure experienced by any single part of your body and thus reducing damage.To sum up: an acceleration is the change in velocity divided by time. In order to accelerate an object, a force is required to be imparted on that object. Dividing this force by area over which it is exerted will yield the pressure. Pressure is what causes damage to materials, and fluids may be used to distribute force evenly over larger areas thus reducing pressure.Oh, and to address your example about not being killed by being stopped while walking 2 miles per hour. This could in fact easily kill someone, provided the time of impact is small enough. To use a second example, think of a car travelling 70 mph on the highway. Using the brakes to come to a stop over a time of 4 seconds is safe, but coming to a stop in a tenth of a second by slamming into a brick wall is not safe. Time here is equally as important as total change in velocity is.
jamesdewAug 20, 2009
There are not that many of them, at least not in Stockholm.
chubbydigitsAug 24, 2009
Swedish tank cops, Stern.. Stern but fair.
easilydomainAug 26, 2009
hmmmm...interesting
danieltttAug 30, 2009
Just had to spoil the whole damn thing, didn't you?