Houston, we have a problem or two... - Page 3 - Steve Saunders Goldwing Forums

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post #21 of 82 (permalink) Old 01-02-2019, 06:02 AM
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Another problem:I saw this on "MYTHBUSTERS"
You drop a bullet from a certain height and measure the time it took to hit the ground then you shoot the bullet with a gun perfectly horizontal at the same height which one will take longer to hit the ground?
Simple, they both hit at the same time.
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post #22 of 82 (permalink) Old 01-02-2019, 06:20 AM Thread Starter
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Yep Dave , thats what they say.
I just came up with another problem
You shoot a powerful gun PERFECTLY VERTICAL Which will take longer for the bullet, the way up or down? What about if you do the same in vacuum.
I have an answer but not sure it is correct. There is an element of this problem that most will forget to consider.
Dont forget we need two answers: in air and in vacuum

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post #23 of 82 (permalink) Old 01-02-2019, 12:17 PM
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I think the bullet would go up faster then down in atmosphere and down faster than up in a vacuum, but. In a vacuum it would also travel up faster and farther so it might not matter.

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post #24 of 82 (permalink) Old 01-02-2019, 02:53 PM
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For the first part with the possible exception your old Daisy BB gun the terminal velocity will be less than the muzzle velocity so longer down than up.

For the second part acceleration down will equal deceleration up so the time will be the same.
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post #25 of 82 (permalink) Old 01-02-2019, 07:12 PM
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Simple, they both hit at the same time.
It depends. Is there a variation in local terrain so that the bullet hits a hillside before it would reach the ground if the local terrain were flat?

Is the starting height large enough that the curvature of the Earth will have an effect? How far does the bullet travel before reaching the ground?

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post #26 of 82 (permalink) Old 01-02-2019, 09:29 PM
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It depends. Is there a variation in local terrain so that the bullet hits a hillside before it would reach the ground if the local terrain were flat?

Is the starting height large enough that the curvature of the Earth will have an effect? How far does the bullet travel before reaching the ground?
No, the premise is the bullet is fired perfectly level over a flat surface. The bullet travels as far as it can go in the time it takes to drop the distance from the muzzle to the ground. For instance, if the distance from the ground is far enough to take 1 second to drop and the velocity is 1000 feet per second it would travel 1000 feet before hitting the ground.

With no God over the state, the state then becomes not the defender of liberty but the definer of liberty.


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post #27 of 82 (permalink) Old 01-03-2019, 09:26 PM
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No, the premise is the bullet is fired perfectly level over a flat surface. The bullet travels as far as it can go in the time it takes to drop the distance from the muzzle to the ground. For instance, if the distance from the ground is far enough to take 1 second to drop and the velocity is 1000 feet per second it would travel 1000 feet before hitting the ground.
Dave,

I will agree that the premise is flat ground but the original post did not clearly state that.

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post #28 of 82 (permalink) Old 01-04-2019, 07:23 PM Thread Starter
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Another questionable thing is if we see the colors alike. When I was a kid my mother told me a certain color was red. Regardless how I saw it she called it red.
Then another kid was seeing a color totally different than I did . His mother told him the color was red.
As grownups we both agree that the color we are seeing is red but we might see totally different colors.
Is there any proof we see the same color looking at an object?

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post #29 of 82 (permalink) Old 01-04-2019, 08:54 PM
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post #30 of 82 (permalink) Old 01-04-2019, 09:00 PM
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Originally Posted by Peter Goldwing View Post
Another questionable thing is if we see the colors alike. When I was a kid my mother told me a certain color was red. Regardless how I saw it she called it red.
Then another kid was seeing a color totally different than I did . His mother told him the color was red.
As grownups we both agree that the color we are seeing is red but we might see totally different colors.
Is there any proof we see the same color looking at an object?
Peter,

There is science that can measure the wavelength of light that is emitted by an object so you can prove that the light entering the eye from the object is the same wavelength.

There is no way to measure the reaction of the rods and cones in the eye when the light strikes them. There is no way to measure the reaction of the brain to the signals from the eye.

There are no methods for humans to directly share experiences (such as the famous Vulcan mind meld).

So there is no proof that light creates the same experience in different people. Given that some people are color blind (most noticeably Red-Green) it is obvious that not all people see the same color when looking at an object.

The question hinges on definition of the word "see".

This is very similar to the old question: If a tree falls in the forest and no one is there to hear it, does it make a sound?

The answer depends on the definition of sound. Is sound the vibrations in the air or the perceptions caused when the vibrations impact the human ear?

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