Problem Set 10 & Solutions

Problem Set 10 & Solutions - 4 K&K problem 12.1...

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Phys116 Problem Set 10 Due: Friday, Nov. 21, 2003 before the start of class. Please write your TA’s name at the top of your solution set. Communicate your reasoning in your solutions, concisely and clearly. Efforts are as important as correct answers. 1. K&K, problem 6.34. (Easiest using energy considerations.) 2. Consider an automobile initially being driven forward in a straight line. Without the driver being aware, a practical joker has rigidly mounted a large flywheel in the trunk of the car with a large spin angular momentum pointed parallel to the velocity of the car. When the driver begins to turn left, what happens to the force loading on the car’s wheels? (The force with which they press on the ground.) Be as specific as you can, using words and sketches. If the driver turned left very fast, in what direction might the car flip upside down? 3. K&K, problem 7.5.
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Unformatted text preview: 4. K&K problem 12.1. 5. (From Ritchie Patterson.) The gestation period of elephants is 21 months. Suppose we place a freshly impregnated elephant in a spaceship and launch it into interstellar space at a constant speed of v = 0.9 c . (Don't worry, we have sent along plenty of hay, and the elephant will enjoy the planet to which it is sent.) (a) At what distance from earth will the elephant give birth? Give the answer in both the earth's frame and the elephant's frame. Verify that you are correct by checking with the Lorentz transformation. (b) If we monitor the condition of the elephant from earth by radio (the signals travel at the speed of light), at what time after the launch will we hear the squeals of the newborn calf? 6. K&K problem 12.14. We will use this result in class before too long. 7. K&K problem 12.4. 8. K&K problem 12.10....
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