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Unformatted text preview: homework 01 NOORANI, ZOHEB Latest unpenalized work: Jan 18 2008 Friday 04:00 (after this date you can not make a perfect score). Work cutoff: Jan 18 2008, 4:00 am. Question 1, chap 1, sect 5. part 1 of 1 10 points A block of material has dimensions 4.1 cm by 6.9 cm by 4.6 cm. Its mass is 584 g. What is the density? Answer in units of g/cm3 . Question 2, chap 1, sect 6. part 1 of 1 10 points An acceleration of 1 mi/h/s is equal to: Answer in units of m/s2 . Question 3, chap 1, sect 6. part 1 of 1 10 points Convert 31.8 to radians. Answer in units of rad. Question 4, chap 1, sect 6. part 1 of 1 10 points A rectangular building lot is 153 ft by 151 ft. Find the area of this lot in m2 . Answer in units of m2 . Question 5, chap 1, sect 5. part 1 of 1 10 points In 1990 there were approximately 7 106 people people living in New York City. New York City has an area of approximately 8.31 102 square kilometers. What was the population density of New York City in 1990? Answer in units of people/km2 . Question 6, chap 1, sect 5. part 1 of 2 10 points Consider two planets, denoted 1 and 2, which have uniform mass distributions. The mass density and the radius of planet 1 are 1 and R1 , respectively, and those of planet 2 are 1 2 and R2 Which of the following gives the ratio of M1 their masses ? M2 1. M1 = M2 M1 = 2. M2 M1 = M2 1 2 1 2 2 1 2 1 1 2 1 2 1 2 2 1 2 1 2 1 R2 R1 R1 R2 R2 R1 R1 R2 R2 R1 R1 R2 R1 R2 R1 R2 R1 R2 R2 R1
2 2 3. M1 4. = M2 M1 5. = M2 6. 7. M1 = M2 M1 = M2 2 3 2 3 M1 = 8. M2 M1 9. = M2 M1 = 10. M2 3 3 Question 7, chap 1, sect 5. part 2 of 2 10 points Which of the following gives the ratio of A1 the circular areas, , defined by the two A2 equators? A1 = 1. A2 2. 3. A1 = A2 A1 = A2 R2 R1 R1 R2 R2 R1 R1 R2 R1 R2
3 2 2 A1 = 4. A2 A1 5. = A2 2 homework 01 NOORANI, ZOHEB A1 6. = A2 7. 8. A1 = A2 A1 = A2 R1 R2 R2 R1 R1 R2
3 2 2 3 A1 R2 9. = A2 R1 R2 A1 = 10. A2 R1 3 Question 8, chap 1, sect 5. part 1 of 1 10 points What is the mass of water required to fill a circular hot tub 3 m in diameter and 1.2 m deep? Answer in units of kg. Question 9, chap 1, sect 1. part 1 of 1 10 points Two points in a rectangular coordinate system have the coordinates (6.5 cm, 3.5 cm) and (7.9 cm, 6.5 cm). Find the distance between these points. Answer in units of cm. ...
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