Tuesday, November 15, 2011
With the knowledge that the future of our energy lies within the children of today, the U.S. Department of Energy’s Wind Powering America Program developed the Wind for Schools program in 2006. The main objectives of this program include: to encourage university-level wind education and training, to promote on-site education at the K-12 level by installing wind systems at schools unable to fund them on their own, and to support K-12 wind energy education in schools with installed systems and surrounding schools. This program is currently operating in eleven states, and is open for starting in other states. The most used and recommended product for schools wishing to participate is the Skystream wind turbine. When schools install this, they also get a full communication system which allows students to monitor the performance of their turbine and energy consumption. This is a great tool for the learning community.
Saturday, November 5, 2011
The following is a brief summary by Nick of Indiana's Consumer Guide for wind systems:
Wind electric systems are not only for the big businesses and important companies; they are also for the average homeowner. If a home is sitting on land that has enough empty cleared space and wind speed, then installing a wind electric system could possible to the best option for their energy needs. If it is unknown whether or not there is enough wind speed, U.S. Wind Resource Maps is a valuable tool. The cost of installing the system depends on the height of the tower and the diameter of the rotor blade. Also, a general rule of thumb is that the wind tower will cost anywhere from 1,000 to 5,000 dollars per kilowatt on initial installation. It is recommended that a wind electric system be installed by a company that specializes in it. This is not something that should be attempted without an expertise in electricity and manufacturing. For a home wind electric system, it is suggested to use a guyed system. There are three different types of guyed systems: balance, stand-alone, and grid-connected. All three have their own benefits and it is something that a home owner should look into before deciding to install a system.
Friday, November 4, 2011
The following video shows the set up and the experiment. A screen shot showing the analysis done to find work follows.
To find the work, the area under the P-V diagram, use menu Analyze, Integral. It is important that the work is negative. Why is it negative?
Wednesday, November 2, 2011
On the day of the egg launch, there was minimal wind, with maximum gusts of not much more than 1 m/s. Due to the size of the egg capsules, the wind likely had a negligible effect on the distance of the egg launch. But as a well struck baseball will only travel half as far as it would have it were to travel in a vacuum, air resistance does have an appreciable effect. Overall, out of 100 eggs, 21 survived with the maximum distance being over 60 meters. Obviously their grade wasn't based on the survival of the eggs. You can read more about the rules, parameters and grading of the Egg Launch at this site.
The AP Physics still participate in this event as an enjoyable review of collisions, conservation of energy and projectile motion. They do not need to write the paper again, but they do need to do the calculations. Their rules are there are no rules except to construct the protective container in the first five minutes of class.