Good at math or not?

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Re: Good at math or not?

Postby LANDM » Jan 28th, 2018, 12:10 pm

GenesisGT wrote:but the edge of the universe is 46B LYrs from Knox Mtn.


Ahhhhh, the age-old human mistake of thinking we are the center of the universe.
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Re: Good at math or not?

Postby Ka-El » Jan 28th, 2018, 12:19 pm

We're not even near the centre of our own galaxy - and that's a very good thing for us.
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Re: Good at math or not?

Postby oldtrucker » Jan 28th, 2018, 12:30 pm

A. 34.23km
B. 17.98km
C. 41.87Km
D. 49.02km

Answer C. Good job 'Jhunter199' ...you got it right!

Lookout 445m above sea level
Lake level 342m above sea level
103 m/338 ft above lake surface level
sq.root of 338ft =18.38
18.38 x 1.23 =22.61nm
= 41.87 kms
Next time you are at the first lookout at Knox Mountain you will know the super important info that you can see for 41.87 km.
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Re: Good at math or not?

Postby Verum » Jan 28th, 2018, 1:20 pm

oldtrucker wrote:A. 34.23km
B. 17.98km
C. 41.87Km
D. 49.02km

Answer C. Good job 'Jhunter199' ...you got it right!

Lookout 445m above sea level
Lake level 342m above sea level
103 m/338 ft above lake surface level
sq.root of 338ft =18.38
18.38 x 1.23 =22.61nm
= 41.87 kms
Next time you are at the first lookout at Knox Mountain you will know the super important info that you can see for 41.87 km.

I got a different answer, but I could be wrong, that if the elevation is 103m, taking into account the curvature of the Earth, you can see roughly 36.2km. I worked this out using trig and Pythagoras' theorem, both giving answers within a few mm of each other.
Radius of earth in m 6.371*10^6, a^2+b^2=c^2 a=distance from centre of earth to lake level (6371342m), b=distance from eyes to horizon(x), c=distance from eyes to centre of earth(6371445)
=> 6371342^2+x^2=6371445^2
=> x=(6371445^2-6371342^2)^0.5
=36228.54m
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Re: Good at math or not?

Postby oldtrucker » Jan 28th, 2018, 1:48 pm

Actually 'Verum' I am not good/smart enough at math to go the route you went. I cheated.
I used a thing called "minimum enroute altitude" or MEA calculation.
Square root of height above ground level in feet times 1.23= line of sight/radio reception in nautical miles.
Just thought I would come up with a really dumb practical math application for the Kelowna area.
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Re: Good at math or not?

Postby GenesisGT » Jan 28th, 2018, 2:12 pm

The wonder of math, both answers are correct.

41.8km is the radio horizon distance (radio horizon) =4.12 * height of the antenna(square root)

36.2km is the line of sight distance
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Re: Good at math or not?

Postby Ka-El » Jan 28th, 2018, 2:16 pm

oldtrucker wrote: Just thought I would come up with a really dumb practical math application for the Kelowna area.

Still, all very impressive answers :smt045
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Re: Good at math or not?

Postby alanjh595 » Jan 28th, 2018, 2:19 pm

Ka-El wrote:
oldtrucker wrote: Just thought I would come up with a really dumb practical math application for the Kelowna area.

Still, all very impressive answers :smt045


I agree, well thought out and interesting.
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Re: Good at math or not?

Postby Verum » Jan 29th, 2018, 1:12 pm

I always felt that with some confidence and good direction, the average person can be competent with mathematics, at least to the point of passing the highest level in high-school (Calculus 12). After that things start to get a bit more challenging. CBC have a video basically supporting the value of confidence and proper teaching methods:
http://www.cbc.ca/player/play/1146918979902/
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Re: Good at math or not?

Postby dirtybiker » Jan 29th, 2018, 1:19 pm

GenesisGT wrote: nobody can see infinity.


I can it is about 123 feet away parked in my neighbours driveway.
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Re: Good at math or not?

Postby alanjh595 » Apr 8th, 2018, 2:48 pm

blue_moon wrote:There is a division of people into humanitarians and technicians. I think this is due to the work of the brain's hemispheres.


A N D....your point is? Just like there are significant differences in the human brain between sexes. Recognise and celebrate the differences. It would be a horrible planet to live on if we all thought within the same hemisphere of the brain.
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Re: Good at math or not?

Postby Bpeep » Apr 9th, 2018, 4:41 pm

What's a hemisphere?
I'm not a brain surgeon so there's no doubt I, and many others don't know what that is.
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Re: Good at math or not?

Postby Bsuds » Apr 9th, 2018, 5:06 pm

Bpeep wrote:What's a hemisphere?
I'm not a brain surgeon so there's no doubt I, and many others don't know what that is.


It's half of a sphere so just a polite way to say she/he has only half a brain.. :biggrin:
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Re: Good at math or not?

Postby d0nb » Apr 15th, 2018, 10:27 pm

oldtrucker wrote:Barely passed until grade 9...then failed completely. Took grade 9 and 10 math the next year...failed completely.
Gave up after that.
Then I discovered that I really liked airplanes .
Was awesome at math after that.


Bingo.

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The ability to force yourself to pay attention will suffice to make you reasonably good at almost anything, but to truly excel, there needs to be passion.
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Re: Good at math or not?

Postby d0nb » Apr 15th, 2018, 10:30 pm

LANDM wrote:
GenesisGT wrote:but the edge of the universe is 46B LYrs from Knox Mtn.


Ahhhhh, the age-old human mistake of thinking we are the center of the universe.


Assuming an isotropic universe, (the same in all directions) everyone is at the center.
State is the name of the coldest of all cold monsters. Coldly it lies; and this lie slips from its mouth: 'I, the state, am the people.’ - Friedrich Nietzsche
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