2-24-09

Michael Poland 2/24/09 The bell sounded and the usual people were late to class. Luckily for them there was a substitute teacher in for Mr. Manning today so no one would get a detention for being late. The sub also happened to be a new marketing teacher at the school. The beginning of class was going smooth until a desk broke. Fortunately Matt fixed it in a jiffy. We then turned to an energy and roller coasters paper which is due on Wednesday (2/25). There were some notes on the board needed to complete the problems.
 * HE(Heat Energy)= TE (Thermal Energy)
 * There is no Heat energy for problem #1
 * Pay attention to last sentence in each problem and read it carefully.

The information in number one you needed to know is a 400kg cart rolls down the hill, reaching point A at a speed of 8m/s. How fast is the cart traveling at point B? The final velocity is 21.35 m/s This was obtained by subtracting the PE From the total energy to find the KE. The total energy remains the same anywhere on the track. With the kinetic energy of 91200J it is divided by half the mass (100kg) and then squared. That is how the velocity is obtained for all problems. Problems two and three had similar work involved but 2000J was subtracted from each point because of thermal energy. The Rollercoaster page that we recieved today is due tomorrow.

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