Monday september 30 2013 why no calculators focus on

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Unformatted text preview: Friday: review, make eqn. sheet, take quiz. • Saturday: take a break (if you want to)! Monday, September 30, 2013 Why no calculators? √ • • Focus on conceptual points, and human The math will be trivial. E.g. π ≈ e ≈ 10 ≈ 3 thinking skills. (Vs. Robot-think, avoid it!) • Everyone spends enough time on their devices, it’s important to not be overly dependent on them. Will help your future employability if you can solve problems that computer’s can’t. Like captcha! Monday, September 30, 2013 Quiz advice • Read through each question, and think a moment before you calculate anything. • No complicated calculations should be needed. If you find yourself doing one, it’s a warning sign that you’re probably on the wrong track. Japanese food packaging analogy: always one easy way to open it trying it the wrong way can be impossible. If you need to, move on to another question, and come back to it at the end. Monday, September 30, 2013 Sample quiz question • A pendulum consists of a light rope and a solid gold ball. It has a period of 1 second. (a) What would be the period if the ball is replaced with a silver one of the same size? (b) What about if the rope is replaced with a rope of four times the original length? (c)What about the original pendulum, but on planet X, where everything weighs 9 times its weight on Earth? Monday, September 30, 2013 Dimensional Analysis • An easy way to solve many problems!!!! • 3 basic quantities with units: length, mass and time. In metric, e.g. MKS. • Everything with units is built from them. • Learning how to use this will pay off, on our quizzes and later. It is super important. Monday, September 30, 2013 Pendulum, by D.A. • Pendulum bob’s mass = M. Rope (negligible mass) has length L. Restoring force due to gravity, so the period will also depend on g. • Units of g = accel: [g]= length/time^2. ￿ • Period: T ∼ (L/g) Note: M can’t enter! • Can now immediately solve the sample questions! Monda...
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This note was uploaded on 02/11/2014 for the course PHYSICS 2C taught by Professor Hicks during the Fall '09 term at UCSD.

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