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# ch09 - Chapter 9 CENTER OF MASS AND LINEAR MOMENTUM 1 Which...

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Chapter 9: CENTER OF MASS AND LINEAR MOMENTUM 1. Which one of the following statements is true? A. the center of mass of an object must lie within the object B. all the mass of an object is actually concentrated at its center of mass C. the center of mass of an object cannot move if there is zero net force on the object D. the center of mass of a cylinder must lie on its axis E. none of the above ans: E 2. The x and y coordinates of the center of mass of the three-particle system shown below are: x (m) y (m) 1m 2m 3m 4m •••• ••• 4kg 5kg 6kg A. 0 , 0 B. 1 . 3m, 1 . 7m C. 1 . 4m, 1 . 9m D. 1 . 9m, 2 . 5m E. 1 . 4m, 2 . ans: C 3. The center of mass of a uniform disk of radius R is located: A. on the rim B. a distance R/ 2 from the center C. a distance R/ 3 from the center D. a distance 2 R/ 3 from the center E. at the center ans: E 4. The center of mass of the system consisting of Earth, the Sun, and the planet Mars is: A. closer to Earth than to either of the other bodies B. closer to the Sun than to either of the other bodies C. closer to Mars than to either of the other bodies D. at the geometric center of the triangle formed by the three bodies E. at the center of the line joining Earth and Mars ans: B 120 Chapter 9: CENTER OF MASS AND LINEAR MOMENTUM

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5. The center of mass of Earth’s atmosphere is: A. a little less than halfway between Earth’s surface and the outer boundary of the atmosphere B. near the surface of Earth C. near the outer boundary of the atmosphere D. near the center of Earth E. none of the above ans: D 6. A thick uniform wire is bent into the shape of the letter “U” as shown. Which point indicates the location of the center of mass of this wire? •• A B C DE ans: B 7. A machinist starts with three identical square plates but cuts one corner from one of them, two corners from the second, and three corners from the third. Rank the three plates according to the x coordinate of their centers of mass, from smallest to largest. x y 1 x y 2 x y 3 A. 1, 2, 3 B. 1 and 2 tie, then 3 C. 1, then 2 and 3 tie D. 3, 2, 1 E. 1 and 3 tie, then 2 ans: E Chapter 9: CENTER OF MASS AND LINEAR MOMENTUM 121
8. Block A, with a mass of 4 kg, is moving with a speed of 2 . 0m / s while block B, with a mass of 8 kg, is moving in the opposite direction with a speed of 3 m / s. The center of mass of the two block-system is moving with a velocity of: A. 1 . 3m / s in the same direction as A B. 1 . / s in the same direction as B C. 2 .

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ch09 - Chapter 9 CENTER OF MASS AND LINEAR MOMENTUM 1 Which...

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