As I was scrolling through Instagram, I came across a post by Nasa that said today, October 14th, 2017, is the 70th anniversary of supersonic flight. Supersonic flight is when something is traveling faster than the speed of sound, which is 343 m/s. Of course for the past 70 years this has only been done by noncommercial planes. Well, Nasa is currently working on making supersonic flight a reality for commercial planes. That would mean that you can travel from New York to Los Angeles in 2 hours. Now it takes over 6 hours. Nasa has been researching shock waves, cruise efficiency, and the effect of sonic booms on the environment. Sonic booms are loud boom sounds caused by the waves of sound. It occurs when an object travels at supersonic speed. If Nasa is able to make this a reality in will revolutionize modern travel.
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This weekend I watched a lot of football. Watching it this week made me realize how bad it must hurt to get hit by a 240+ pound linebacker. The average running back runs about 4.72 m/sec and has a mass of about 97.5 kg. If the linebacker stops the running back in 1 second, the force on the running back is about 460 newtons. Due to newtons third law, that same force is thrown onto the linebacker as well. A linebacker that is famous for his powerful tackles is James Harrison for the Pittsburgh Steelers. He is 125 kg... Sometimes football is better to be watched then played.
During this week in AP Physics C, we have begun our studies in Dynamics. At first it was not too bad... then came air resistance. It seems like a pretty simple concept but it is in fact not. I don't have much experience in Calculus yet, so the differential equations are still pretty difficult to understand. There is still a good amount of time before the test for me to study this concept so hopefully I will get a good grasp on it before the test. Other than the differential equations, the confusing part for me is why there are two equations for Fdrag which are Fdrag = bv and Fdrag = cv2 . Why do some circumstances use one equation and others use the other equation? Even though this concept is really difficult, I think it is extremely important for accurate calculations. In past physics courses we have always neglected air resistance but here on earth there is usually air all around.