Author Topic: for the Math minded types  (Read 4016 times)

Offline Ciaphas

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for the Math minded types
« on: May 01, 2019, 07:25:21 PM »
I have an object that weighs: 6300lbs

This object falls from 12,000 ft at 1,714 ft per mile and travels 7 miles (36,960ft). How fast is it traveling?





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« Last Edit: May 01, 2019, 07:32:28 PM by Ciaphas »
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Offline BoilerDown

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Re: for the Math minded types
« Reply #1 on: May 01, 2019, 07:28:41 PM »
at 1,714 ft per second

How fast is it traveling?

Seems you answered your own question.
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Offline Ciaphas

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for the Math minded types
« Reply #2 on: May 01, 2019, 07:29:20 PM »
updated original post as follows:

1714 ft per mile
« Last Edit: May 01, 2019, 07:32:59 PM by Ciaphas »
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Offline Vulcan

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Re: for the Math minded types
« Reply #3 on: May 01, 2019, 07:37:01 PM »
updated original post as follows:

1714 ft per mile

but there's 5280 feet per mile according to google. And why are you still using the Imperial measurement system - are you guys still a british colony?

Offline Ciaphas

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for the Math minded types
« Reply #4 on: May 01, 2019, 07:38:18 PM »
Over the course of a mile (5280 ft) you fall 1714 ft.

If we were still a British colony, we would be using the metric system.

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Offline Meatwad

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Re: for the Math minded types
« Reply #5 on: May 01, 2019, 07:55:01 PM »
I have an object that weighs: 6300lbs

This object falls from 12,000 ft at 1,714 ft per mile and travels 7 miles (36,960ft). How fast is it traveling?





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So the object ends up 24,960 feet below ground?
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Offline Ciaphas

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for the Math minded types
« Reply #6 on: May 01, 2019, 08:03:09 PM »
1714 ft x 7 = 11,998 ft

12,000 ft / 7 = 1714.28571 ft per mile


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Online Devil 505

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Re: for the Math minded types
« Reply #7 on: May 01, 2019, 08:16:27 PM »
Something is clearly wrong with the equation.

1 mile = 5280 ft

an object that travels 1714 feet travels about .325 miles and cannot travel 7 miles

Feet per mile is not a measurement for speed or velocity. you need a distance factor and a time factor - e.g. Feet per second, miles per hour, etc.




Or are you trying to figure out how the Millennium Falcon made the Kessel Run in less than 12 parsecs?  :devil
« Last Edit: May 01, 2019, 08:21:52 PM by Devil 505 »
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Offline Ciaphas

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Re: for the Math minded types
« Reply #8 on: May 01, 2019, 08:38:31 PM »
it's all there. It's in the wording.

An object falls from 12,000 ft at a rate of 1714 ft per mile travelled and travels total distance of 7 miles, how fast, in mph is the object traveling?

It would appear to me that:

Mass = 6300 lbs
Velocity = 1714 ft per mile
Height = 12,000 ft
Distance is 7 miles (36,960 ft)

It can be calculated without time but it requires starting velocity, ending velocity, acceleration and gravity.

To solve this we have to assume that 1714 ft per mile is the starting velocity. we must now find the rate of acceleration based on gravity and object weight and in turn this will give us it's final velocity over distance.

v^2=u^2+2as

V = final velocity
U = initial velocity
A = acceleration
S = distance




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Online Devil 505

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Re: for the Math minded types
« Reply #9 on: May 01, 2019, 09:03:19 PM »
feet per mile measures exactly one thing - how many feet are in a mile, which is 5280 feet. That is a measurement of distance, not velocity.

either your units are mislabeled or you are missing a factor of time.
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Offline Ciaphas

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for the Math minded types
« Reply #10 on: May 01, 2019, 09:06:25 PM »
This is why I need this solved.

We had a T-6 Texan go down about 30 miles north of our base. We are tasked with locating the two ejections seats but they are only willing to give us basic information.

ie GVW 6300 (full load), altitude of ejection 12k and a distance traveled from aircrew to impact (7 miles).

all help is appreciated.


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Offline Vraciu

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Re: for the Math minded types
« Reply #11 on: May 01, 2019, 09:18:45 PM »
You’re saying they lost 1700 feet vertically for every mile covered horizontally, no?

Just remember it is going to be an arc.   Lateral distance will decrease with time.    You’re gonna’ need to break out your Trig and Calculus books. 
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Offline Ciaphas

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Re: for the Math minded types
« Reply #12 on: May 01, 2019, 09:19:35 PM »
that's what the information provided eludes to.


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Offline 100Coogn

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Re: for the Math minded types
« Reply #13 on: May 01, 2019, 09:46:57 PM »
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Offline guncrasher

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Re: for the Math minded types
« Reply #14 on: May 01, 2019, 10:14:12 PM »
terminal velocity?

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