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The Appendix E-SUPPLEMENTAL assignment is worth 40 points. Each problem is worth 8 points. Comments on particular exercises are provided below. 1. Many people know that the weight of an object varies on different planets, but did you know that the weight of an object on earth also varies according to the elevation of the object? In particular, the weight of an object follows this equation: C w r = - 2 , where C is a constant, and r is the distance that the object is from the center of the earth. a. Solve the equation C w r = - 2 for r. . is answer the So, situation. in this number positive a be must r because Reject or 1 2 2 2 w C r w C r w C r w C r r w C C w r C w r = - = - = = = = = - I deducted 2 points. You did not identify the negative solution as a possible answer. b.Suppose that an object is 75 pounds when it is at sea level. Find the value of C that makes the equation true. (Sea level is 4,000 miles from the center of the earth.)

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C 000 1,200,000, ) 4000 ( 75 ) 4000 ( 75 2 2 2 = = = = -
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