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#41 ermd

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Posted 06 December 2006 - 06:35 PM

The conveyor belt is changing speed to effectively keep the plane's displacement at 0.

The way I saw it, the plane overcomes drag and friction (and hence doesn't roll backwards off the conveyor), but it doesn't have any uplift to overcome it's weight with because it is still stationary relative to the mass of air surrounding it.

#42 John

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Posted 06 December 2006 - 06:42 PM

Yeah that's what i was trying to say lol

#43 paddyb67

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Posted 06 December 2006 - 09:42 PM

aeroplanes take off because they move relative to the air. this plane is not moving relative to the air. this plan will not take off.


a better question:

if it takes one and a half hens one and a half days to lay one and a half eggs, how long would it take six hens to lay six eggs?

#44 The Wedge Effect

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Posted 06 December 2006 - 10:03 PM

Erm...it depends how many of these chickens are female.

#45 bred

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Posted 06 December 2006 - 10:07 PM

Depends if the mutilated (half) hen can still lay eggs or not!
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#46 paddyb67

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Posted 06 December 2006 - 10:35 PM

all hens can lay eggs and bred when we say 2.4 children do we actually mean most families have 2 children then a bit of another?

#47 The Wedge Effect

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Posted 06 December 2006 - 10:52 PM

It'd still be 1 and a half days, wouldn't it?

#48 John

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Posted 06 December 2006 - 10:54 PM

It would take 6 hens, 1 day to produce 6 eggs.

EDIT:

Or 6 days, dependent upon interpretation.

#49 bred

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Posted 06 December 2006 - 11:57 PM

QUOTE(paddyb67 @ Dec 6 2006, 10:35 PM) View Post

all hens can lay eggs and bred when we say 2.4 children do we actually mean most families have 2 children then a bit of another?

No - I was being a realist not a theorist.
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#50 George

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Posted 07 December 2006 - 11:46 AM

I read about the problem with the plane on a conveyer belt quite recently:

http://www.straightdope.com/columns/060203.html

#51 The Wedge Effect

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Posted 07 December 2006 - 03:58 PM

QUOTE(John @ Dec 6 2006, 10:54 PM) View Post
It would take 6 hens, 1 day to produce 6 eggs.

EDIT:

Or 6 days, dependent upon interpretation.


Or one and a half day, if I interpret it to be all of them laying at once, at the same time.


#52 John

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Posted 07 December 2006 - 04:44 PM

QUOTE(The Wedge Effect @ Dec 7 2006, 03:58 PM) View Post

QUOTE(John @ Dec 6 2006, 10:54 PM) View Post
It would take 6 hens, 1 day to produce 6 eggs.

EDIT:

Or 6 days, dependent upon interpretation.


Or one and a half day, if I interpret it to be all of them laying at once, at the same time.



Thats how my first interpretation works, but if it is one and a half days it would be a total of 9 eggs

#53 bred

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Posted 07 December 2006 - 04:48 PM

1.5 hens 1.5 days to lay 1.5 eggs
6 hens 0.375 days to lay 1.5 eggs
6 hens 0.375x4=1.5days to lay 6 eggs, no?
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#54 John

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Posted 07 December 2006 - 04:54 PM

If all hens lay 1.5 eggs every 1.5 days

Then 1 hen will lay 1.5 eggs in 1.5 days
2 will lay 3 eggs in 1.5 days
3 will lay 4.5 eggs in 1.5 days
4 will lay 6 eggs in 1.5 days
5 will lay 7.5 eggs in 1.5 days
6 will lay 9 eggs in 1.5 days

If you restric each hen to one day, it means they will lay one egg each per day, and thus 6 hens will lay 6 eggs in one day

BUT!

I only one hen per day can lay one egg, then you are correct bred.

As it is blatantly obvious it takes a hen one day to lay an egg

#55 The Wedge Effect

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Posted 07 December 2006 - 04:56 PM

That depend if you assume all hen take the same length of time to lay an egg or not. If they all do take the same length of time, then it's fair to assume it takes 1.5 days for all the hens to lay six eggs.

Edit: John, it says one and a half hen takes one and a half days to lay an egg and a half. I'm assuming the half a hen lays half an egg. So if it was a whole hen, i.e. 2 hen, it'd lay two eggs in one and a half days.

#56 John

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Posted 07 December 2006 - 04:59 PM

QUOTE(The Wedge Effect @ Dec 7 2006, 04:56 PM) View Post

That depend if you assume all hen take the same length of time to lay an egg or not. If they all do take the same length of time, then it's fair to assume it takes 1.5 days for all the hens to lay six eggs.

Edit: John, it says one and a half hen takes one and a half days to lay an egg and a half. I'm assuming the half a hen lays half an egg. So if it was a whole hen, i.e. 2 hen, it'd lay two eggs in one and a half days.


I edited my post before you posted

#57 John

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Posted 08 December 2006 - 01:40 PM

Takes 4 days top lay 6 eggs, as the rate of production per hen per egg is 0.666666666... of an egg.

(No i didnt solve it my genius of a friend did lol)

#58 paddyb67

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Posted 19 December 2006 - 04:59 PM

actually it takes one and a half days. the question tells you that the gestation period of a hen is one and a half days so each hen will be able to lay one egg per day. one hen lays one egg, half a hen lays half an egg, six hens lay six eggs.


now, consider a swimming pull. you are in a boat in the centre of the pull, and there is a led weight in the boat. the swimming pool is filled right to the brim with water. you now take the led weight from the boat and throw it into the pool. Ignoring effects of splashing, will the water level go down, up (spill over), or stay the same?

#59 John

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Posted 19 December 2006 - 06:13 PM

QUOTE(paddyb67 @ Dec 19 2006, 04:59 PM) View Post

actually it takes one and a half days. the question tells you that the gestation period of a hen is one and a half days so each hen will be able to lay one egg per day. one hen lays one egg, half a hen lays half an egg, six hens lay six eggs.


Google it, it's 4 days.

QUOTE(paddyb67 @ Dec 19 2006, 04:59 PM) View Post

now, consider a swimming pull. you are in a boat in the centre of the pull, and there is a led weight in the boat. the swimming pool is filled right to the brim with water. you now take the led weight from the boat and throw it into the pool. Ignoring effects of splashing, will the water level go down, up (spill over), or stay the same?


It will stay the same.

This is because when the boat is in the water with the weight in the boat, the pond is full to the brim.

Once you take the weight out, the pool is filled slightly below the brim.

Thus once you put the weight into the water, the space taken up by the weight causees the water to increases in volume to be back where it began, full to the brim.

#60 paddyb67

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Posted 19 December 2006 - 11:48 PM

sorry john, wrong and wrong. you obviously wont accept the 1st answer,ill just tell you its 1.5 and leave it at that. you're wrong for the second one though but ill give others a chance before explaining. they asked me it at my oxford interview btw.





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