This confuses me. If a wind powered device such as a sailboat or a kiteboarder is following the wind, how do they get back to where they started? or do they?
211791
When you sail, you cut across the wind at an angle. The more you turn into the wind or sheet in the sail, the faster you go. To get back where you started from you 'tack' into the wind at a sharp angle, then turn the other way in a zig-zag pattern. The sail tries to push the boat back but the hull and keel cut into the water so you actually move into the wind
390400
Pros: 1.  When it powers turbines to create cheap clean energy\n           2.   When there is wind in the sails so boaters can enjoy a\n                  day out on the water.\n           3.   When you go to fly a kite and there is enough wind  to\n                  make it air born.\nCons. 1.  Strong winds can topple large trees causing damage.\n            2.   Winds can create battering waves and tidal surges \n                  that flood low lying areas.\n            3.   Winds can create white out conditions in snowstorms\n                  leading to accidents.
233852
You've answered the question just by asking it.  It's called kite surfing.
194765
not at all - just most wakeboards are slightly lower volume than beginners kiteboards so can be a bit harder to start with.\ngood for higher winds though.
498994
I don't understand the question. Are you asking about a South wind, North wind, East wind and West wind?
561709
It's all relative. Easiest way to see the answer to this problem is to first imagine the river and log stationary. Assuming the boat keeps the same speed S, he travels an hour and then turns around and takes an hour to get back(a total of 2hrs). If the river/log has some speed v then when he travels away from the log he has speed S+v (with current) but since the log has speed v he travels at speed S away from the log (same as the stationary case) and on the way back has speed S-v (against current) and the log has speed v  and so he travels at speed v+S-v = S towards the log. So it is the same as the stationary case: one hr out and one hr back = 2hr.
60195
wind. the speed of the current traveling through the lines. when they pass each other they make contact.
450267
This is related to Newton's law: An object in motion or at rest will stay in motion or at rest unless acted upon by an external force.\n\nTo elaborate, an object travelling in a straight line will keep on travelling in that straight line at a constant speed unless something acts on it.\n\nWhen you are in the car with your ball, everything in the car is travelling at the same speed, so you through the ball up and it comes straight back down. But if you throw the ball up and then jam on the cars brakes, the ball will keep moving at its original speed but the car is slowing down, so the ball would fly forward into the front windshield.\n\nLast point, if you throw the ball out the window, it will appear to fly backwards - It is just slowing down compared to the car because unlike the air inside the car, the air outside is at rest, so the ball will be flying through the air at a high speed and the wind drag will slow it quite rapidly.
152764
Well, first you eat a lot of beans...\n\n\nActually, it has to do with climate.  You can create wind currents in an enclosed invironment simply by creating different temperatures.
42664
You can't see the wind, only the leaves and limbs as they respond to its ebb and flow. You can't touch the wind but it touches you with it's warm summer breezes and winter's blustery blow. But, you can hear the wind as it whips through the trees. Try to catch the wind you wind up on your knees.\n\nOff the top of my head. This was fun!!
114439
in the unconstrained case (no floor), water from the lowest hole will reach the furtherest given enough time (vertical space to drop). With a vertical constraint (a floor), the optimal coverage will be from a hole one third the way up from the floor, not the top hole near the surface of the water, and not a hole at floor level.\n\nAlthough I really don't see how this applies to wind sailing:-)
528935
first why do we need his moving 30 meters and what does it mean anyway? i don't understand the question here.. first he let the kite and it was flying and the string made an angle of 47 degrees.. and then he walked somewhere 30 m? so now it is an angle of 39 degrees? i could say some little things to help only:\n\n-we watch a man as a spot that doesn't move\n-a string has first brace at force T1, and it is equal the strength of wind that is flowing against kites dimension S.. so it is T1=S(paralel) * P(paralel).. \n-this task is too complicated, i'll write it down, see your mail tomorrow and send you, it is 2 am here..\n-good night
648547
The wind exerts more pressure on the open side of the cups than it does on the rounded side, so that no matter which direction the wind is coming from, the cups will spin.  Wind velocity is calculated by the speed of the spin -- rotations are counted and divided by the time of measurement.  It was invented in 1846 but didn't really become accurate until electrical spin counters and timers were added.
645796
I have never seen the board. Check out www.wakeboarder.com fourms and post your question there. Thoes guys know everything about wakeboarding.
256247
only energy is transferred.  Think about it - if you're in the  ocean and a wave comes by, you bob up and down but aren't swept away.
318246
It's been a while , but some years ago we vacationed in Kill Devil Hills..outer banks ,North Carolina.\nThey have what is called "high dunes" there..Huuuuge enormous dunes...and of course it is a tourist attraction...anyways..We bought a Kite...climbed them dunes all the way to the top and started flying the thing..Everybody did it...must have been tons of Kites in the air.\nSo , mine is flying and I tugged on the line and the thing bomb dives towards a crowd of people..I go...oh shi.t...and pull as hard as I can and just a few feet over the crowds head,the kite went up again...I go ..hmmmm...that was fun...lets try that again...and so I did...Bomb dives again and this time it came even closer to the crowd...they started yelling at us...how rude...lol...so , kite goes up and then again kite dives at them and..... oops...right into the back of some real big burly guy...Kite broke...guy screams...starts running towards us...yelling nasty things and we take off...running like hell , in loose sand down the dunes and half way down I lose my balance and tumble through the sand.....Big burly guy stood at the top of the dunes and gave us the one finger salute...how rude.lol\nDon't know why that adventure came back to my mind but what fun that was...lol
448249
To get the maximum performance from a sailboat, you would "luff and touch her".  Meaning that you steer to the point where the sails just begin to shake, and then back off just a touch.  You would make minor adjustments from there.