Is the air pressure above the roof higher or lower than the pressure inside the house? Explain. What is the pressure difference?
bernoulli’s equation
p+ev^2=constant
p at the top of the roof is reduced to compensate for the high velocity to keep p + ev^2/2 constant
p=1.01.10^5-[50^2]/2[pascals]
p below is higher
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With the Remote-Control Machines set, kids can build motorized vehicles and machines and control them with a wireless remote control unit. It comes with a 48-page manual that guides kids in the building process. Each of the steps in building the models is accompanied by explanations of the operating principles covering each of the components—remote control, gears, and batteries. The language in the guidebook makes complex ideas accessible to kids.
The six-button infrared, touchpad remote allows kids to control three motors simultaneously, moving each of them forward or in reverse. The three motors can be combined to make complex vehicles and machines in numerous configurations.
Assemble ten models demonstrating different ways in which the motors can be used including a bulldozer, car, three-wheeler, crane, antique car, plow, folding car, formula one racer, three-blade dozer, and robotic arm.
The kit comes with three motors, remote control unit, battery holder, and building blocks. The 182 building pieces included in this set are compatible with those in all Thames & Kosmos Construction Series kits, Physics Series kits, wind power kits, and Hydropower kits.
Duration : 0:1:6
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I’ve been hearing that it can cost an excess of $20,000 for a whole professionally installed sysyem.
I was looking online and found this http://www.sunelec.com/index.php?main_page=pv_systems&id=1699&type=OFFG
Is this really true? 780 Watts for ~$1,000?
Could be, there are other ways to prevent from buying the normal expensive ones.
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Duration : 0:2:2
For around $700 worth of material, we now have a working 3,49m wind turbine and 10m tower concept.
The power output is ranging from 100-400 watts in mediocre winds, but can go much higher in stronger winds (possible well over 1000W, but probably less than 1500W)
The question remains, for how long will it work…and what will break first?
That is exactly the answer we seek, and is it resonably built even though on a tight budget?
The results and experiences will be used to build a really big turbine, which is going to be used for electrical lightning and heating of the family house.
This test-turbine however is used to electrify the greenhouse on the farm with some light bulbs, radio, and small 200W-heaters.
The reason why the loads turning on and off is because of the digital load controller steering the loads according to the wind speed.
Duration : 0:0:55
The EVAL-10 EnerChip CC Solar Energy Harvesting kit demonstrates a simple single chip drop in solution for solar EH energy conversion, energy storage and power management. Works great with the Texas Instruments eZ430-RF2500 wireless kit.
Duration : 0:4:18
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Article Source: Zac Linzmeier
Duration : 0:1:16
admin | 
08 30th, 2011| 