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Hoffman Amps Forum image Author Topic: hung up on easy math  (Read 7542 times)

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Offline shooter

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hung up on easy math
« on: October 23, 2019, 06:27:09 pm »
so I'm trying to crank out F=M*A
my 2ducks say M = 6 * 10^24
also speed is 460 M/S (67,000 mph)

I'm hung 'cuz there is no  :dontknow: acceleration, the object (earth:) is a "constant" speed, well it lost a millisecond over the last 100yrs  :icon_biggrin:

so do I square the S anyway?

thanks
dave
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Offline PRR

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Re: hung up on easy math
« Reply #1 on: October 24, 2019, 03:04:59 pm »
I don't even understand the problem. Are you moving the earth or flying away from it? Is there a picture?

Offline shooter

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Re: hung up on easy math
« Reply #2 on: October 24, 2019, 03:25:07 pm »
 :l2:

what I'm looking for is a quick way to equate a near impossible feat
I want to 'splain to someone quick;
ya, if you get 7 billion folks all "pushing" at once we can generate X force, the "rock" we're on is producing Y force so we gotta do that ALOT, kinda thing

for the one that "bite' I do want to have a math starting point for further consideration, BUT I don't want to re-learn vectors, angular velocity, ettal  :laugh:

Back to the problem;
If any object has a constant speed do you assume Acceleration = 1 in the simple F = M*A?

I get that we're moving with the rock n it's not a great example, but just the fact the rock weighs 6 X 10^24 kg I gotta do something with that  :laugh:
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Offline PRR

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Re: hung up on easy math
« Reply #3 on: October 25, 2019, 04:24:52 pm »
Still not understanding your question.

In free space, if velocity is constant, there is no acceleration.

On the surface of the earth, constant velocity (including zero), we "feel" a 1 Gee acceleration due to gravity.

If I build a rocket, with thrust equal to (earth) weight, and run it far from any gravity-mass, it will accelerate at 1 Gee and gain speed quickly.

If I start that rocket on the earth's surface, 1 Gee thrust will make it light on its pad but it will not lift. (The big Saturn V lifts at about 1.2 Gee thrust, so 0.2 Gee net acceleration, and is accelerating slower than a Geo for a while, until its mass is reduced by fuel burn.)

If all the people on Earth pushed the same way, what would they push *against*? Yes, I can push East on a tree, but my feet push West. I'm not going to move the earth, just strain a small section of soil. (With an excavator I can push the tree hard enough to rip soil, but also make skid-marks under the treads. The earth as a whole does not move.)

If all the people on earth were bunched-up in a group, and "pushed with their feet", each person has 8,000 miles of rock under their footprint. Even if they had a stick reaching to the moon so they could exert push without causing a matching pull on the earth, the mass of rock per person is 6,000,000 times the weight of a person, so while we-all could "move the earth" it wouldn't move much.

It is almost exactly the 52nd anniversary of "Levitating the Pentagon". "No one claims that the Pentagon actually moved. Maybe there was a mistake in the incantation." However they did have a Permit to lift the Pentagon, but only 3 feet (reduced from 300).
« Last Edit: October 25, 2019, 04:29:36 pm by PRR »

Offline shooter

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Re: hung up on easy math
« Reply #4 on: October 25, 2019, 05:01:49 pm »
Quote
In free space, if velocity is constant, there is no acceleration.
Thank you
did FINALLY figure it out, gravity is what hung me  :think1: (hung me up a few times climbing also :) 

Quote
so while we-all could "move the earth" it wouldn't move much.
yep, my eventual point.
workin up a translator from logical  thought human to emotional based versions.  WAY harder than communicating with guitar types  :icon_biggrin:



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Offline shooter

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Re: hung up on easy math
« Reply #5 on: January 01, 2020, 06:45:50 pm »
my current gig has me playin volatiles n lead dust, so.....

Freq = 22,000 yrs

dividing by 1 gets me .000045455 yrs, not very helpful, so;
I X 12 months X 365 days X 24hrs X 60 min to get 286.9776 minutes, useful.

IF I got on the right conversion bus  :dontknow:
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Offline Williamblake

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Re: hung up on easy math
« Reply #6 on: January 02, 2020, 10:08:21 am »
Years is time, frequency is hertz, dividing by one isnt much of a change. Which planets month are 365 days i wonder?

Offline shooter

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Re: hung up on easy math
« Reply #7 on: January 02, 2020, 10:50:52 am »
Quote
Years is time, frequency is hertz

thinking that's the bus I shoulda started on; I'm trying to get to the bus for miles, feet, inches 
should be done with volatiles n lead tomorrow  :w2:
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