Physics Problem Solving Session: 309K, Test #3 and Homework 11, Exams of Physics

Download Physics Problem Solving Session: 309K, Test #3 and Homework 11 and more Exams Physics in PDF only on Docsity! Test #3 and Homework 11, 309K Physics April 13 2009 1 In which direction spin hurricanes and typhoons explain your choice Answer Looking from the North Pole. The earth turns counter clockwise (the west moves eastward). This motion drags the high pressure weather structures along and gives the hurricanes a counter clockwise spin. At the South Pole the earth still rotates the west toward the east but your observation direction has changed and the motion of the earth is clockwise. Impeding on the weather this spin direction and forcing Typhoons to rotate clockwise. 2 Calculate the moment in inertia of a baseball. Its diameter is 23/8 inches and it weighs 5 ounces (1 ounce = 28 gram). Answer: For a solid ball the moment of inertia I is 2mr2/5 (book pg 147). r2 = (23/16 x .0254 m)2 = .00133 m2; m = 5 ounces = 5 x .028 kg; I = .00187 kgm2. 3 Helium atoms have an average velocity of 1600 m/s at room temperature. How high will the atom fly, when it leaves the space shuttle straight up? (Neglect collisions)? Answer: h = (v2)/2g because m·g·h =m·v2/2. At the shuttle g = 9.2 m/sec2. h = 16002/2x10 = 128000 m. 4 You have assembled a pendulum clock, but the instruction manual did not list the length of the pendulum. Its length is clearly adjustable. You can find the proper distance with 3 settings, how? Answer: The time the pendulum swings from right to left depends on the length of the pendulum. So you choose 3 settings for the position of the weight on the end of the heavy discus at the end of the suspension and