9-11 Presentation at NMSR, May 19 2010

ergo said:
I really don't know how they load trucks from silos. Please explain it to us.
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kamyon%20dolum.gif


So when loading trucks from a silo, they just dump everything in at once because it doesn't impart any more force on the truck than if they let it out slowly?
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According to your understanding of physics, is the bolded part a correct statement? Yes or no. This really isn't a difficult question.
 
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ergo said:
Yes, gravity is pulling all things in the same direction. Resistance of other objects causes those things to move in other directions. The pieces of rubble are not all moving in the same direction.

The bolded is incorrect.
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Do you think it takes less braking force to stop a cement mixer full of wet cement, in which all the mixed granules are separate from each other and due to the truck's rotating barrel are all moving in different directions, than to stop another cement mixer filled with an equal weight of solidified cement with its barrel rotation turned off, assuming the same truck speed and the same stopping distance?

Why, or why not?

Respectfully,
Myriad
 
DGM said:
"Different vectors"? Wouldn't that be the building below (in this case)?
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No, those would be the horizontal and rebound pathways that the rubble particles take when they hit the intact building components. This is how the energy is dispersed. It is not crushing the building.

Therefore, no, your statement about the lower building does not follow.
 
ergo said:
No, those would be the horizontal and rebound pathways that the rubble particles take when they hit the intact building components. This is how the energy is dispersed. It is not crushing the building.
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Crushing is energy being dispersed. That's the whole point of crumple zones, airbags, etc.
 
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ergo said:
No, those would be the horizontal and rebound pathways that the rubble particles take when they hit the intact building components. This is how the energy is dispersed. It is not crushing the building.

Therefore, no, your statement about the lower building does not follow.
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Read a physics text.
 
ergo:

Let's try this, If I drop a bowling ball on the ground (perfectly flat) does it "change direction"?



If you put your foot in between the ball and the ground would your foot sustain some sort of damage (or at least pain)? If you answer yes, why? Did the ball still "change direction?


I'm keeping this painfully simple because you seem to want to ignore a very simple thing (gravity and momentum).
 
Myriad said:
Do you think it takes less braking force to stop a cement mixer full of wet cement, in which all the mixed granules are separate from each other and due to the truck's rotating barrel are all moving in different directions, than to stop another cement mixer filled with an equal weight of solidified cement with its barrel rotation turned off, assuming the same truck speed and the same stopping distance?

Why, or why not?
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This is an incorrect analogy. We are talking about linear momentum of a system of particles. You are talking here about a truck carrying a load.
 
ergo said:
This is an incorrect analogy. We are talking about linear momentum of a system of particles. You are talking here about a truck carrying a load.
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A truck isn't a system of particles? :confused:
 
ergo said:
No, those would be the horizontal and rebound pathways that the rubble particles take when they hit the intact building components. This is how the energy is dispersed. It is not crushing the building.

Therefore, no, your statement about the lower building does not follow.
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How did they get "horizontal"? They had to impact something that was "down", right?
 
ergo said:
This is an incorrect analogy. We are talking about linear momentum of a system of particles. You are talking here about a truck carrying a load.
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Dude, everything is "a system of particles".
 
So you're not going to answer my simple question?

ergo said:
I really don't know how they load trucks from silos. Please explain it to us.
Click to expand...

kamyon%20dolum.gif


So when loading trucks from a silo, they just dump everything in at once because it doesn't impart any more force on the truck than if they let it out slowly?
Click to expand...

According to your understanding of physics, is the bolded part a correct statement? Yes or no. This really isn't a difficult question.
 
excaza said:
A truck isn't a system of particles? :confused:
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Are we discussing particle physics or laws of motion? If we're discussing particles, why not discuss your intact upper block as a system of particles?
 
This is shaping up to a nice Stundie factory. :D

Ergo, imagine two scenarios:

1. I drop a cement block on a flat surface. The cement block is 1m3, and to simplify, let's say it has a mass of 1 ton.

2. I empty a box of sand on the same surface. The total mass of the sand is 1 ton.

In which scenario do I impart the largest amount of force on the surface?
 
DGM said:
How did they get "horizontal"? They had to impact something that was "down", right?
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They impacted the intact components of the building, yes. As I stated before. These components are not crushed; they deflect the rubble pieces, which then have to move in another direction. This is what resistance is. This is what we mean when we say "unless acted on by another object". Energy gets dispersed into different directions.
 
ergo said:
They impacted the intact components of the building, yes. As I stated before. These components are not crushed; they deflect the rubble pieces, which then have to move in another direction. This is what resistance is. This is what we mean when we say "unless acted on by another object". Energy gets dispersed into different directions.
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The energy gets dispersed? What caused the energy to disperse, ergo? Was some kind of force necessary for this to happen, or did it happen spontaneously?
 
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