Question

1. a) What is the angular momentum of a 0.25 kg sphere rotating on the end of a piece of a rod with a mass of 0.17 kg of length 0.75m? The rod makes 1.99 revolutions per second? (I = msphere L^2 + 1/3mrodL^2) Ans: 2.2 kg m^2/s L = Iw b) In which direction does its angular momentum point? Circle one. a. out of the page b. into the page c. left d. right e. up f. down 2. a) A figure skater rotates counter clockwise on ice at a rate of 3.5 rad/s with her arms extended horizontally. When she lowers her arms to her side, she speeds up to 7.5 rad/s. Find the ratio of her moment of inertia in the first case to that in the second case. Ans: 2.1 b) In which direction does her angular momentum point? Circle one. a. out of the page b. into the page c. left d. right e. up f. down

          1. a) What is the angular momentum of a 0.25 kg sphere rotating on the end of a piece of a rod with a mass of 0.17 kg of length 0.75m? The rod makes 1.99 revolutions per second? (I = msphere L^2 + 1/3mrodL^2) Ans: 2.2 kg m^2/s
L = Iw
b) In which direction does its angular momentum point? Circle one.
a. out of the page b. into the page c. left d. right e. up f. down
2. a) A figure skater rotates counter clockwise on ice at a rate of 3.5 rad/s with her arms extended horizontally. When she lowers her arms to her side, she speeds up to 7.5 rad/s. Find the ratio of her moment of inertia in the first case to that in the second case. Ans: 2.1
b) In which direction does her angular momentum point? Circle one.
a. out of the page b. into the page c. left d. right e. up f. down

1. a) What is the angular momentum of a 0.25 kg sphere rotating on the end of a piece of a rod with a mass of 0.17 kg of length 0.75m? The rod makes 1.99 revolutions per second? (I = msphere L^2 + 1/3mrodL^2) Ans: 2.2 kg m^2/s
L = Iw
b) In which direction does its angular momentum point? Circle one.
a. out of the page b. into the page c. left d. right e. up f. down
2. a) A figure skater rotates counter clockwise on ice at a rate of 3.5 rad/s with her arms extended horizontally. When she lowers her arms to her side, she speeds up to 7.5 rad/s. Find the ratio of her moment of inertia in the first case to that in the second case. Ans: 2.1
b) In which direction does her angular momentum point? Circle one.
a. out of the page b. into the page c. left d. right e. up f. down

Added by Beth S.

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