Trees
Nail a string of fencing barbed wire to a young aspen tree 4 feet from the ground. Assuming the tree will grow 9 feet taller each year, how high off of the ground will the wire be in 9.5 years?
*This is the final question on the arborist certification exam
- by codycharron
*This is the final question on the arborist certification exam
- by codycharron
Labels: SharedPuzzle
posted by Mr Fahrenheit at
11:48 PM
11 Comments:
4 feet.
I'm assuming that there's a trick that I'm missing, but I'm getting 89.5 ft.
9 ft a year, in 9.5 years plus the initial 4... right?
Like I said I'm sure that theres a trick I'm missing...
The only other thing I can thing about is that the trunk of the tree doesn't get any longer and that only the top of the tree is what is actually going, so then the wire will never move.
it would be 4 feet because a tree grows from the top so telling us that it grows 9 ft a year is pointless information.
it wont grow any high, the trees grow from the upper side.
They grow from the inside out and top up. 4 feet is the answer
Dicots (woody plants, trees) only exhibit elongated growth at buds. Stalks, stems, and trunks grow in girth only.
Have you ever been in the woods and seen a fence in the air, clinging to an aspen? Me either; not sober anyway.
Of course it would be four feet. Trees grow from that top. That is a common trick question, and tends to get people who don't know much about trees.
Donald Sobol used that fact in one of his Encyclopedia Brown books.
Maybe aspens are different from oak trees.. I don't know.. but I do know this.. I can show you an oak tree that has a peice of barbed wire sticking out of both sides above your head in the back yard of the house where I grew up.
Aspens don't get very thick, so i wouldn't think it would engulf the wire the way oak tree's do. So it would probably stay at 4 feet.
Oak trees on the otherhand will begin to grow around the wire. Depending on the size of the oak tree at the beginning, it will take a few years to many years for the wire to be going nearly through the center of the tree. Once it starts getting close to the center, it starts getting stretched upwards..
Nailing a fence to an oak tree will enventually uproot the nearby fence posts.. lol.. I've seen it done..
-eb
In 9.5 years the barbed wire will be laying on the ground because the nail and subsequent ferrous oxide poisoning will have killed the Aspen in 3.5 years and in the next 6 years the environment would have decayed the Aspen back into the Earth.
doct be a know-it-all Mister Know-it-All
This is late and goofy, but this would NOT be an Exam question because you would never nail a fence to a tree!
(I was looking for exam help...)
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