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From: David Canzi <dmcanzi@uwaterloo.ca>
Newsgroups: sci.physics
Subject: Re: The Apollo moon landings
Date: Thu, 12 Jun 2025 15:19:48 -0400
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On 6/10/25 22:28, Bertitaylor wrote:
> On Tue, 10 Jun 2025 19:37:11 +0000, David Canzi wrote:
> 
>> On 6/9/25 20:46, Bertitaylor wrote:
>>> On Mon, 9 Jun 2025 23:48:57 +0000, Peter Moylan wrote:
>>>
>>>> On 10/06/25 09:21, David Canzi wrote:
>>>>> On 6/9/25 18:10, Bertitaylor wrote:
>>>>
>>>>>> As they were on Earth they merely shuffled leaving deep prints.
>>>>
>>>>> If you make stuff up about the evidence instead of looking at the
>>>>> evidence, you can remain proudly wrong for the rest of your life.
>>>
>>> Speak for yourself. The big fat impious footprints on the Moon were
>>> shown as evidence for Moon landing
>>
>> I notice you deleted the link I provided you to a YouTube video
>> that shows astronauts who were not merely shuffling, but were
>> moving briskly.  And as a bonus, one of the astronauts stopped,
>> then jumped up and down vertically.  From that jump it's possible
>> to estimate the acceleration due to gravity, and it's way less
>> than on the Earth.  Here's the link again.
>>
>> https://youtu.be/efzYblYVUFk?t=40
>>
>>> Arindam wondered why they were that deep. Surely some 50 Kg of thrust
>>> spread out wide could not create that depth?
>>
>> How deep are they?
> 
> Deeper than 115 Kg Arindam's prints upon a sandy by each.
> 
> Explain how you estimated the depth of
>> the footprints based on the image of them.
> 
> See the length, should be 30cm. Looks like the depth is easily more than
> 1 cm as that looks 1/30th of the length. Really deep.
> 
> 
> How deep should
>> they be?
> 
> As they weighed with suits not more than 60Kg and as Arindam's prints on
> sand is not more than 5 mm deep they should be say be no more than 3mm
> deep.

Beach sand on Earth doesn't have the same properties everywhere.
On the beaches of Point Pelee, my feet sank deeply into the wet sand
at the edge of the water.  At Lion's Head Beach my feet didn't leave
any visible impression on the wet sand.

I've taken a look at a boot print image from the moon, and find it a
challenge to figure out how deep the print actually is.  It would
help to know how far above the horizon the sun was when the photo
was taken.

The footprint contains a very clear impression of the boot's treads.
I doubt that you would see that if you walked in boots over dry
beach sand anywhere on Earth.  Sand or dust on the surface
of the moon has not formed by the same processes that have formed
sand on Earth, and so you can't assume it has the same properties.

> Explain how you know how much downward pressure
>> the astronaut's feet exerted on the dust, and how soft that
>> dust is.