On Friday, no homework was turned in. Although, Mrs. Coats-Haan did walk around and check to make sure we completed the detailed analysis of projectile motion from Thursday. After that we learned about the crime we were going to investigate for the day. The given information was that Barbie Einstein was in South Beach, Florida with friends and had a room on the eighth floor. She also had a restraining order against Ken Einstein. The scale model set up in the room was every 20 cm on the scale model was equal to 10 feet in the real crime scene. Every story was 10 feet on the real crime scene, or 20 cm for the scale. Each group had four minutes at the scale model to measure what they thought necessary to determine the initial horizontal velocity. After groups found this out, they were told to make up a story about what happened. Chris believed that Barbie was a hooker and tried to kill herself, and Mrs. Coats-Haan commented on how it wasn’t a very original story. If we did not finish calculations or the poster to represent those calculations, we will have ten minutes on Monday to finish, before we present. Besides that, the only homework is our lab reports from the dart gun lab are due Tuesday and our review guide that is due Friday before the test.
Question of the day: ‘How did you calculate Barbie's horizontal velocity when she left the hotel window?’
Our group used the Pythagorean Theorem to find the magnitude. We then multiplied that number by 980 (because we kept our measurements in centimeters). After that we found the angle by using inverse tangent. We multiplied that by two and found the sine of it. We used our previous answer (length of magnitude times 980) and divided it by the sine of twice the angle. That gave us v squared. We found the square root of that and that was our answer.
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