Wind Definition and 829 Threads

Okay, so here's the thing... D=\frac{1}{2}*C_D*r*v^2*A I need to find the Force pushing against a sign that is attached to a vehicle. The area (A) of the sign is 60"X28" which is 42.672 m^2 The velocity (v) that the vehicle will be moving is roughly 80 miles per hour which converts...

Hey, I'm trying to measure the lift/drag of a wing in a low-speed wind tunnel, the only ways i might know are using a load cell or force probs, but have no idea about how to set it all up and my school doesn't have the material. So please, can u give me any way using simple things to measure...

Suppose there were a nearby supernova, say 10 to 20 lightyears away. It's not close enough to incenerate the earth. Would such an event cause the solar wind to become swept away? If so, would there come a great earthquake as the wave went by the earth? I suppose that the gravity of such a wave...

I have a Thermo I problem: Given: 80m diameter wind turbine rotating at 20rpm under steady wind conditions at an average wind velocity of 30kph. The eff of the system is 35%. Need: Power generated Assumptions (made by me):delta PE ~0; mass=constant; operating at Steady Sate; T~constant...

So why exactly are wind turbines so expensive? I mean arent the generators alone $5-$10 million? One of my professors (hes just a physicist though) said he doesn't really understand why it costs so much either. The next week he brought up maybe there's sophisticated equipment making sure the...

Where did everyone go? I feel so alone here...

Part one: Supposed: A wind funnel. Circular Input radius = 600" Windspeed = 24 ft/sec Air weight = 2 lbs/yd3 Circular Output radius = 60" Disregard = backpressure. 1 HP = 560 ft lb/ sec Solve for = (1) Theoretical Wind speed at output (2) HP at output. Part two: Backpressure will...

I have a question I am pondering about. If there was a wind and the windspeed is faster than the speed of sound, would there be any kind of sonic boom effect created?

Hi everyone, I need to build a wind power generator for a grade 11 physics project, but i dont' want to spend too much money on it. Can anyone tell me a cost-effective way of making a wind power generator that works? Thanks

Can anyone help me with this question. I'm not really sure where to start. A wind with speed 45m/s blows across a roof 20m long and 12m wide. The pressure inside the room is 1x10^5 Pa. Neglecting the small difference in thickness of the roof, what is the net force on this roof due to the...

Ok I have built this car for a school project that is supposed to go against the wind. As there is a wind it should be able to drive into it (powered by the wind). Now the car is built and it is working. I have mounted a horizontal windmill that through gearing powers the back wheels...

Our local weatherman assured his audience that although the wind chill would reduce apparent temperature during that day, at night the wind would actually seem to warm a body. I am assuming he was not referring to an incoming warm front, or anything to do with cloud cover, just the perception...

I must construct a car which is propelled solely by wind energy. The car should be able to drive straight into the wind. Have you got any ideas?

I am a student in Malmö, Sweden currently preparing for the IYPT (international young physicists tournament) 2005 in Switzerland. We are supposed to do a 10 minute presentation, solving the following problem: Windcar Construct a car which is propelled solely by wind energy. The car should be...

why doesn't Coriolis force affect the wind speed but only the wind direction?

Wind Car Theory...for assignment... I am a student and i have to explain the wind car theory. I really need help. I need to come up with equations and real explanation. I'd be really happy if you could help me. You can email me at : ngkho@yahoo.com.hk Sorry again for posting my message here...

//It's the same as in college level help forum but it fits better here i think...// Now it's time for me and a friend to prepare our project for a physics tournament in school. The task is: Construct a car which is proppelled solely by wind energy. The car should be able to drive !straight...

An airplane pilot flies a plane that has an air speed of 450 mi/H. She needs to fly from Denver to Chicago, which lies on a line 1150 miles long at an angle of 25 degrees north of east (measured from Denver.) A constant jet stream of 280 mi/H is coming from the southeast (ie, along the 45...

I am doing a homework assignment for my General Engineering class and am really frustrated because I can't get it, and I remember doing this sort of problem in high school, but forget how to do it. Here it is A plane flies (in still air) at 250 mi/hr. On Monday morning the plane leaves point...

what is solar wind? is it carrying particles? what is its effect to our planet,the Earth?

i have calculated volume and weight from different size hailstones. i now have to calculate the wind speed needed to keep a hailstone of each size aloft. i am stuck on which equation to use... should i solve using D = 1/2(C*rho*A*v^2) ? for rho do i plug in the density of air or of each...

A light plane is headed due south with a speed relative to still air of 200 km/h. After 1 hour, the pilot notices that they have covered only 190 km and their direction is not south but southeast. What is the wind velocity in km/h and what angle it it north of east?

The power generated from the aerogenerator is from the kinetic energy of the wind which pass throught it. So, after the wind passed through the aerogenerator, it's kinetic energy decreases. So, will the temperature of the wind drop after passing through the generator since its kinetic energy is...

Definition: http://www.weather.com/glossary/m.html I have spent a lot of time playing with high voltage. For one HV experiment we were using steam or smoke for some reason...hmmm...I don't even remember why exactly, but when the system was on, in effect we had a highly charged, mini...

How do solar wind particles get trapped in a planet's magnetosphere? The particles travel along the Sun's magnetic field lines, right? And then they switch to traveling along the planet's field lines? How? When they get trapped, are they still supersonic? Is it correct to say that...

How fast could a space based windmill turn when driven by the solar wind? Would such a device produce more or less energy than a solar panel of the same cost?

A jet airliner moving initially at 795 mph to the east where there is no wind moves into a region where the wind is blowing at 140 mph in a direction 56 degrees north of east. What is the new speed of the aircraft with respect to the ground? Answer in units of mph. how can i start this off

How many points are there on the Beaufort scale for measuring wind force?

i just woke up and i looked at my electric fan...and noticed a lot of dust had accumulated on the fan...anyone haf any idea y? shouldn't the wind generated from the fan blow the dust away?