12. Kepler\'s Second Law of planetary motion states that planets sweep out equal

Question

12. Kepler's Second Law of planetary motion states that planets sweep out equal areas in equal time. This happens because .. A. the Sun exerts the same torque throughout the orbit of planets. (B) the Sun exerts more torque when they are closer and less torque when they are further away C. the Sun exerts less torque when they are closer and more torque when they are further away. D. the Sun exerts no torque, so conservation of angular momentum ensures this. 13. In class a student was on a chair that rotates. I spun the student, and then after a few seconds the student held weights out to the side. The student's angular speed then A. increased. B. did not change. decreased. D. not enough information.

Explanation / Answer

12. kepler 2nd law is about angular motion of planets, so this phenomenon is determined by conservation of angular momentum not torque.

option (d) is correct.

13.for a constant angular momentum, increasing radius will decreases its angular velocity,

so option (c) is correct.

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