P1112 Spring 2009 Homework #6. This homework will not be graded. Quiz on HW#6 and HW#7 the first section of the week of March 9. Solutions will be posted by Tuesday Feb. 24. Only Problems 1, 2, and 5 are relevant for the prelim. Reading: Chapter 5.4, 12.1, 12.2, 6.1, 6.2 Not all concepts will be covered in class – you are responsible for all material in the assigned reading and in the homework problems. Problems: 1. Three identical masses of 5.0 kg each are placed on the x-axis, somewhere in outer space. One mass is at x = -10 cm, one is at the origin and one is at x = 40 cm. What is the net gravitational force (magnitude and direction) on the mass at the origin, due to the other two masses? (You can treat the masses as point-like particles). 2. Weight at equator: Suppose that the Earth is a perfect sphere. You weigh yourself at the North Pole, and your scale reads 600 N. You then take the same scale to the equator and weigh yourself again. What is the reading of the scale? Choose one and explain,
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