Archive for the ‘Physics’ Category

Find the magnitude of the velocity of the canoe relative to the river?

Friday, May 22nd, 2009
John J asked:


A canoe has a velocity of 0.340 m/s southeast relative to the earth. The canoe is on a river that is flowing 0.570 m/s east relative to the earth.

Find the direction of the velocity of the canoe relative to the river.
Express your answer as an angle measured south of west.

Can’t seem to get the answer correctly.

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An ocean wave with an amplitude of 10 meters and a wavelength of 40 meters?

Saturday, May 16th, 2009
. asked:


How fast would it need to be traveling in order for a canoe to go airborne?
http://en.wikipedia.org/wiki/Image:Wave_motion-i18n-mod.svg

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Why do I see a purplish vortex in my vision? And why do I see illusions?

Thursday, March 12th, 2009
crue_boo asked:


Whenever I look up at the sky, or near a bright light…i see this purple tinted vortex. It’s not solid color, as I can see right through it to the clouds, etc. This is the most describing i can do:
*The vortex center is wherever i am looking at
*The patterns are like waves
*It spirals in a circle counter clockwise, and also waves outwards from the center at the same time
*From the center out, it resembles a 5 pedaled “psychedellic” flower that grow and spins
*sometimes it flashes faintly

I tried asking people I know about this and no one seems to see this. Does anyone know what this is about?!

My vision does a few other abnormal things…

*I see things in the corner of my eye ALL the time. things will suddenly move or appear but i am not looking directly at it to beable to distinguish what it is

*I see speckles of VIBRANT almost ultraviolet-type light once in a while…its usually the primary colours that pop up, but sometimes purple too.

*I have what you call white spot syndrom…i see little “spermy” looking things in my vision, which is somewhat common…but in older people (i am 17)

*I see things in a grainy and glowing way recently. It’s not fuzzy…just weird… and moving objects have long trails that stay there for 1-3 seconds approximately

*I am always seeing faces everywhere, not as a hallucination…but I always see the “illusion” in things. Every time i see a face, i point it out and the person does infact see this crazy image that exactly resembles a face. I see them in paint splatters, random and un repeated patterns, wet spots on the road, in wrappers, etc. I also see a lot of other illusions like full bodies, animals, etc, but they usually deal with a living creature. I always seem to see satan’s face..or a demon, with horns, ears, sharp teeth, pointy nose and all…and all the demon faces look exactly the same. I even had a piece of beef jerky that looked EXACTLY like the one on my friends wall (it was that white stuff to fix a hole)

Of this painting my boyfriend’s mom purchased a decade back, I could point out so many things. The painting was of a community or town that was near the water and trees in the distance. i was able to point out a huge alligator coming out of the water that could also be an alligator in a different postion at the same time (i saw it in a piece of island) , a man with a shotgun pointing at the alligator (as if he was protecting the man in the canoe that the alligator seemed to be going for. this man was tiny compared to the alligator and the lumberjack man with the gun, and the canoe man was MEANT to be painted there)(I saw this lumber jack man kind of scattered in the colours of another piece of small island), i pointed out a long cyclopse centipede looking monster (it was really a doc kind of thing for the lakeside homes), i pointed out a killer whale within the tree tops and houses, and i saw people in the bottom corner pointing at the alligator in horror (i saw these people in a bunch of random paint representing the bottom of the bridge with the centipede.)

The reason I bring this one painting up is because everything was sooo exact. And they all had to do with water and the theme, yet my boyfriends mom knows the painter and he said there was no intension in doing so. Am i just extremely visually gifted?

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