Problem : A bird falls from a tree of 20m height. It reaches to ground in 2sec. A bear sees it from a distance of 40m and run to catch it, reaches in 4sec. What is the visible color of the bear? Give your answer along with the reason ......
Lee Boolean just don't go to the reality part ....... Ok let assume : A bird falls from a tree of 20m height. It reaches to ground in 2sec. A bear sees it from a distance of 10m and run to catch it, reaches in 4sec. What is the visible color of the bear? Give your answer along with the reason ......
hmm, was wondering about this mechanical problem on my way home, I must say I am a little disappointed at the answer, maybe its one of those "insider" jokes that only makes sense when you assume a degree in physics. I for one would never have even thought about the speed of the bird falling, but then I did have the same argument as Scott regarding trees on the north pole, but I guess the velocity of the bird is a much clearer give away.
Anyhow... here's a quick riddle for you (not nearly as complicated):... why do polar bears eat seals and fish but never penguins?
A bear does not change color so it would be the same as when it set off. Was it a polar bear, black bear, or brown bear? Did the bird fly away as the bear would have been 2secs too late. Did the bird die? Did the bear eat it? Maybe the polar bear would look a little red around the mouth. I hate these riddles.
sannyasinman : Well tried men ...... but wrong .......
Helen Cater : Don't know the answer ...... It's fine ...... but don't say it a riddle ..... The topic says "MECHANICS PROBLEM" ...... So there may be a valid answer to it ...... Not a riddle answer .....
flighty02 : A real bad answer to a simple mechanics problem .....
Lee Boolean : I think you have quit it way before ......
The bear can't run that fast, so it's a moot question. I think that's the right answer, or the sought-after answer, looking back at the other posts.
It seems silly, though, like one of those papers with 90 instructions listed, and the first instruction is "read all the instructions before you begin", then it goes, take five, add two hundred, next instruction: divide by five, next instruction: multiply by seven...until you get to the last instruction, which says, "disregard all the instructions except for #1."
paradise7 ..... you're mistaken by whole of the problem ...
It's a mechanics question ..... so what's in the question if I say car runs at 200km/sec .....
on earth there is no such car ..... but if I put it in a question .... just by few calculations you would arrive to a answer which is practically not possible .... but on the paper and question it's the right answer .....
The bear is the same color as the tree trunk and when he saw the bird fall he had to climb down 10m, which took him 4 seconds. However, the bird hadn't hit the ground before the bear started climbing down so the time of the bird falling and the bear climbing down were overlapped.
The OP states that the bear saw it "from a distance". It didn't say whether that distance was horizontal or vertical.
Ok let assume : A bird falls from a tree of 20m height. It reaches to ground in 2sec. A bear sees it from a distance of 10m and run to catch it, reaches in 4sec. What is the visible color of the bear? Give your answer along with the reason ......
I was way out in the hinterland. I had that thought of acceleration due to gravity but connected it in a different way to the bear. I still had the answer "white", but not any where near a justifiable reason.
Thanks for spilling the beans. It was getting to me.
Well you thought of acceleration due to gravity, that's basically the answer, and you got the right color. You get full credit from me. I didn't bother reading through the posts. I just answered the question, so I will go back and read your answers. Good Job!
I'm color blind. I only see in black or white. The visible spectrum of light varies at the Poles, and at the North there is total brightness. In the summer the bear would be yellowish, because of oxidation, or greenish due to algal growth. Black is the skin color, and it could reflect white.
Umm, so the difference between 9.78 m/s2 on equator and 9.82 m/s2 on any pole is enough for that? Frankly does not make much sense to me. This difference is way less than the one between 10.0 and 9.82... If this is really the answer, i would say quite silly quiz...
Seriously? Just a hint - for that to make anything close to sense, this bird had to fall from 19.64m. Maximum 19.67m. Now figure out why
Oh, and there are no trees of that height where polar bears live, that's another hint from Scott to question idiocy. If you make a distinction between polar bear and grizzly, you have to take their habitat into account, too.
Like I said, it's a generalization (not exact), and yes it does make a difference. Look at how to launch a space shuttle. I already addressed Scott's post to Flightkeeper, and there was nothing wrong with what he said. I don't need to "figure it out" Here's a hint, I already did.
Ok here is a simple riddle. If very big basket is being filled up with candies and it takes 1 hour to fill it up. Rate of filling is that, the number of candies inside the basket doubles every minute. how long it will take for the basket to be quarter full?
Oops. I can't believe I missed this thread. I hope I'm not too late. Just want to share an answer (without the math).
When I looked at the post, the first thing that came to my mind was "green." Yes. Not that I'm green, but that if there was a tree, and a bird fell from a tree (perhaps a young one, trying to fly from its nest), and that a tree with a nest is absurd without its leaves, then the bear, even if painted blue by its owner ('cause a bear wouldn't run that fast without a trainer), will look green if you're looking from above ('cause the bear would have run for you instead if you're on land).
Does this count? Or am I imagining too much? Or assuming too much?
The answer was focused toward physics and not philosophy, but all answers count.
The bird in the tree falling was used to calculate the gravity of the place where the bear and bird were. When you calculate the gravity it is closer to 10 m/s^2, which is at the North Pole. A bear at the North Pole would be white. The numbers used were nice and easy, so one could do the calculations easy. The actual gravity at the North Pole is not 10 m/s^2, but closer to that than anywhere else.
My guess is the bear would appear as a gray streak because the eye can only receive so much visual information at one time. Brown being a blended color and not a primary color might also attribute to the color distortion. If the bear were Red, Blue or Yellow, the eye would have less information to process and therefore see it in its natural color.
i cant remember pass word. anyway, if the bird can fall vertically twice as fast as the bear can run horozontally that could be called in a mecanical term as a two to one compound ratio. but that is only part of that type of posible mech. nominclacture. somewhere it must be associated with an accual "visible" color posibly ryming with a mech. formula? am i warm\cold?
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