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Who Can Answer This Amazon Interview Question! by Nobody: 9:33pm On Apr 23, 2020
Nairaland gurus...over to you

1 Like 1 Share

Re: Who Can Answer This Amazon Interview Question! by dejt4u(m): 9:44pm On Apr 23, 2020
videomaid:
Nairaland gurus...over to you
zero meter

1 Like 1 Share

Re: Who Can Answer This Amazon Interview Question! by Aizenosa(m): 9:50pm On Apr 23, 2020
Answer is 0m.

Proof: if you divide the rope into two halves you have 40m in length for one half, which is10m short the full length of one of the poles the only way to have 10m distance from the ground is if both poles have 0m distance apart.

Thus, if you move both poles apart the rope stretches and the distance from the ground becomes greater than 10m.

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Re: Who Can Answer This Amazon Interview Question! by COMPENGRFRANK(m): 10:27pm On Apr 23, 2020
THE ANSWER IS 0m THEY REALLY WANT TO KNOW IF YOU ARE A SMART EMPLOYEE
Re: Who Can Answer This Amazon Interview Question! by unclebuddy(m): 4:26am On Apr 24, 2020
My response would be 70m apart

Analysis:

First of all you have an imaginary rectangle shape, with lenght 50m and the breadth is unknown.

The breadth = The space between the poles.

But the breadth is separated by a slacked cable. If the cable was at full stretch, the breadth could easily have been 80m. But it has an excess (slack region) which is directly proportional to the length between the base of the rectangle and the curve tip of the cable= 10m

So I would say the breadth or space between the pole= 80m - 10m = 70m.

My view though.
Re: Who Can Answer This Amazon Interview Question! by dejt4u(m): 4:36am On Apr 24, 2020
unclebuddy:
My response would be 70m apart

Analysis:

First of all you have an imaginary rectangle shape, with lenght 50m and the breadth is unknown.

The breadth = The space between the poles.

But the breadth is separated by a slacked cable. If the cable was at full stretch, the breadth could easily have been 80m. But it has an excess (slack region) which is directly proportional to the length between the base of the rectangle and the curve tip of the cable= 10m

So I would say the breadth or space between the pole= 80m - 10m = 70m.

My view though.

very wrong
Re: Who Can Answer This Amazon Interview Question! by unclebuddy(m): 7:21am On Apr 24, 2020
grin grin grin

Oh boy you wicked ooo! Did you have to add 'very' to the 'wrong'.

We are all here to learn, please guide us on the correct answer.
Re: Who Can Answer This Amazon Interview Question! by femi4: 7:34am On Apr 24, 2020
videomaid:
Nairaland gurus...over to you
0
Re: Who Can Answer This Amazon Interview Question! by Akalia(m): 7:37am On Apr 24, 2020
Either 20m apart in my opinion. Can't go into the calculation. Could be wrong.
Re: Who Can Answer This Amazon Interview Question! by SirWhiteFish: 7:38am On Apr 24, 2020
dejt4u:
zero meter
I used to see your posts and marvel at your calculations.

I am terrible at mathematics but when it comes to writing... Whewwwww. My narration is 100%
Re: Who Can Answer This Amazon Interview Question! by dejt4u(m): 7:52am On Apr 24, 2020
SirWhiteFish:
I used to see your posts and marvel at your calculations.

I am terrible at mathematics but when it comes to writing... Whewwwww. My narration is 100%

thank you so much for this feedback..
Re: Who Can Answer This Amazon Interview Question! by ThrustReverser(m): 10:49am On Apr 24, 2020
Modified: The answer is 40m
The farthest distance that can be between the poles is 80m (The cable will be uniformly horizontal and 50m above the ground). For every 10m decrease in distance between the poles (initially from 80m apart), the height of the cable(lowest/curved part of the cable) above the ground (initially 50m when the cable was uniformly horizontal) also decreases by 10m, so that when this height is 10m, the distance between the poles is 40m. Arithmetic Progression will be useful in the calculations.
Re: Who Can Answer This Amazon Interview Question! by Herard: 10:57am On Apr 24, 2020
40m.

If the 50m length poles are stretched without any dip, the distance between them is 80m.

Therefore, for every 10m reduction in distance between the poles there is a 10m sag.

If the length of the pole is 50m and the bottom of the sag to the ground is 10m, then the dip is 50m-10m=40m.

Since there is 40m dip in the cable, the distance between the poles is 80-40=40m.

P.s to those claiming to be zero, this is wrong. If the height of the poles are 50m and the poles are placed 0m to one another, the cable must surely make contact with the ground since the cable is 30m longer than the pole.

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Re: Who Can Answer This Amazon Interview Question! by dprpikin: 1:09pm On Apr 24, 2020
Herard:
40m.

If the 50m length poles are stretched without any dip, the distance between them is 80m.

Therefore, for every 10m reduction in distance between the poles there is a 10m sag.

If the length of the pole is 50m and the bottom of the sag to the ground is 10m, then the dip is 50m-10m=40m.
other
Since there is 40m dip in the cable, the distance between the poles is 80-40=40m.
other
P.s to those claiming to be zero, this is wrong. If the height of the poles are 50m and the poles are placed 0m to one another, the cable must surely make contact with the ground since the cable is 30m longer than the pole.

I beg to differ, sir.

For every 10m closure of the gap, there is a 5m sag of the rope. Reason is that the sagging occurs equally from each pole. hence, 80m closure= 80/2 = 40. And 80m closure means zero gap between the poles.

1 Like

Re: Who Can Answer This Amazon Interview Question! by fuwaski(m): 6:41pm On Apr 24, 2020
D answer na zelo grin
Re: Who Can Answer This Amazon Interview Question! by macjurek(m): 8:35pm On Apr 24, 2020
40m+40m=80m^2
Re: Who Can Answer This Amazon Interview Question! by Nobody: 10:18pm On Apr 24, 2020
ThrustReverser:
Modified: The answer is 40m
The farthest distance that can be between the poles is 80m (The cable will be uniformly horizontal and 50m above the ground). For every 10m decrease in distance between the poles (initially from 80m apart), the height of the cable(lowest/curved part of the cable) above the ground (initially 50m when the cable was uniformly horizontal) also decreases by 10m, so that when this height is 10m, the distance between the poles is 40m. Arithmetic Progression will be useful in the calculations.

It's zero. Check again. It's a simple but tricky question.
Re: Who Can Answer This Amazon Interview Question! by Ephramed(m): 2:43am On Apr 25, 2020
divide (fold) the rope into 2 equal part = 40m
the length of the pole = 50m

length of pole minus half length of rope = 10m

so the only way the distance of rope from the ground will be 10m is if the rope are folded into 2 equal part making the distance of pole to be 0m

or simply put joining the 2 poles together.
Re: Who Can Answer This Amazon Interview Question! by Nobody: 11:42am On Apr 25, 2020
dejt4u:
zero meter

Aizenosa:
Answer is 0m.

Proof: if you divide the rope into two halves you have 40m in length for one half, which is10m short the full length of one of the poles the only way to have 10m distance from the ground is if both poles have 0m distance apart.

Thus, if you move both poles apart the rope stretches and the distance from the ground becomes greater than 10m.


You guys are smart and the answer was prompt. Highly commendable. Keep it up.

2 Likes 1 Share

Re: Who Can Answer This Amazon Interview Question! by Nobody: 7:18pm On Apr 26, 2020
Happy Sunday!!
Re: Who Can Answer This Amazon Interview Question! by Hausa(m): 1:22am On Apr 27, 2020
Aizenosa:
Answer is 0m.

Proof: if you divide the rope into two halves you have 40m in length for one half, which is10m short the full length of one of the poles the only way to have 10m distance from the ground is if both poles have 0m distance apart.

Thus, if you move both poles apart the rope stretches and the distance from the ground becomes greater than 10m.
Nice. Please, under what topic in mathematics is the question?
Re: Who Can Answer This Amazon Interview Question! by Martinez39s(m): 4:06am On Apr 27, 2020
Assuming the cable is a uniform flexible cable, it's shape is the graph of a hyperbolic cosine function. From my calculations, the poles are about 43.94449154672m apart.

The exact value is 20ln(9). I can show my workings if you want.
Re: Who Can Answer This Amazon Interview Question! by guiddoti: 4:54am On Apr 27, 2020
Total depth =50
Cable length=80
one-side cable Length L =80/2
L=40m
Cable depth V= 50-10
V=40m

V=cosh (h)
h= acosh(V)

H=2h

or

L=sinh (h)
h= asinh (L)
H=2h
Re: Who Can Answer This Amazon Interview Question! by Martinez39s(m): 7:38am On Apr 27, 2020
guiddoti:
Total depth =50
Cable length=80
one-side cable Length L =80/2
L=40m
Cable depth V= 50-10
V=40m

V=cosh (h)
h= acosh(V)

H=2h

or

L=sinh (h)
h= asinh (L)
H=2h
grin grin

Re: Who Can Answer This Amazon Interview Question! by guiddoti: 9:29am On Apr 27, 2020
Martinez39s:
grin grin
. Did I missed it? I have no calculator for inverse cosh, I would have calculated it. But the question is catenary question.

All those saying zero, hahaha.
Re: Who Can Answer This Amazon Interview Question! by Hermeenu(m): 10:03am On Apr 27, 2020
I am still wondering how you guys got zero.
The poles are obviously not on the same radar, or, am I mixing things up here

Well, I think the answer is 45
Re: Who Can Answer This Amazon Interview Question! by Martinez39s(m): 2:11pm On Apr 27, 2020
guiddoti:
. Did I missed it? I have no calculator for inverse cosh, I would have calculated it. But the question is catenary question.
Indeed, it is a catenary problem. The point of my post was that I don't understand your workings. I just can't grasp the sound reasoning behind your workings.

All those saying zero, hahaha.
Lmao. grin The first two guys to comment, especially the second guy, had me laughing hard. grin grin grin
Re: Who Can Answer This Amazon Interview Question! by guiddoti: 5:10pm On Apr 27, 2020
Martinez39s:
Indeed, it is a catenary problem. The point of my post was that I don't understand your workings. I just can't grasp the sound reasoning behind your workings.

Lmao. grin The first two guys to comment, especially the second guy, had me laughing hard. grin grin grin
Okay. That's the step solution to the problem, though. You have idea to it too, when you mentioned hyperbolic function or so.
Re: Who Can Answer This Amazon Interview Question! by Martinez39s(m): 5:23pm On Apr 27, 2020
guiddoti:
Okay. That's the step solution to the problem, though. You have idea to it too, when you mentioned hyperbolic function or so.
Well, a catenary is shape exactly like the graph of a hyperbolic cosine function. The catenary in the op is the graph of
y = 10Cosh(x/10)
Re: Who Can Answer This Amazon Interview Question! by guiddoti: 5:37pm On Apr 27, 2020
Martinez39s:
Well, a catenary is shape exactly like the graph of a hyperbolic cosine function. The catenary in the op is the graph of
Not right.

Catenary

Y= n/p(cosh (xp/n)-1)

n= axial force
p= cable weight
x= horizontal
Y= cable depth

where n/p is neglected(assumed too small)
or

L=n/p(sinh(xp/n)

L=cable length

Because it sag at the middle, total length is divided into two. L= total cable length/2.
Re: Who Can Answer This Amazon Interview Question! by Martinez39s(m): 5:43pm On Apr 27, 2020
guiddoti:
Not right.

Catenary

Y= n/p(cosh (xp/n)-1)

n= axial force
p= cable weight
x= horizontal
Y= cable depth

where n/p is neglected(assumed too small)
or

L=n/p(sinh(xp/n)

L=cable length

Because it sag at the middle, total length is divided into two. L= total cable length/2.

Re: Who Can Answer This Amazon Interview Question! by guiddoti: 5:49pm On Apr 27, 2020
Martinez39s:
Actually, I have used the catenary a lot to model lazy wave riser and presently using it to model S-shaped pipeline.

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