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Conservation of Angular Momementum

Conservation of Angular Momementum
5問 • 2年前
  • Elmaz Okicic
  • 通報

    問題一覧

  • 1

    A diver has left a diving tower and performs a somersault action. Given that no external forces can act on the diver until they hit the water, how can they increase their rate of spin?

    tuck their body tighter to decrease inertia

  • 2

    At the end of a discus throw, throwers often rapidly bring the non-throwing arm as close as possible to their body. This increases their rate of spin, and thus the discus speed, because it:

    decreases the arms radius of gyration

  • 3

    The fact that the total angular momentum of a body must retain constant unless an external force (i.e. not an internal one) acts on it is best descibed by which law?

    law of conservation of momentum

  • 4

    If a figure skater is doing a pirouette is able to hold their arms closer to their body, such that their moment of inertia is reduced by 10%, what will happen to their angular velocity?

    it will increase by 10%

  • 5

    A hurdler is about to clear a hurdle in a race. They therefore lift their lead leg (i.e. lift their front foot) over the hurdle. According to the law of conservation of momentum, in which direction is their upper body likely to rotatate?

    forwards, in the opposite direction to the leg being lifted

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    問題一覧

  • 1

    A diver has left a diving tower and performs a somersault action. Given that no external forces can act on the diver until they hit the water, how can they increase their rate of spin?

    tuck their body tighter to decrease inertia

  • 2

    At the end of a discus throw, throwers often rapidly bring the non-throwing arm as close as possible to their body. This increases their rate of spin, and thus the discus speed, because it:

    decreases the arms radius of gyration

  • 3

    The fact that the total angular momentum of a body must retain constant unless an external force (i.e. not an internal one) acts on it is best descibed by which law?

    law of conservation of momentum

  • 4

    If a figure skater is doing a pirouette is able to hold their arms closer to their body, such that their moment of inertia is reduced by 10%, what will happen to their angular velocity?

    it will increase by 10%

  • 5

    A hurdler is about to clear a hurdle in a race. They therefore lift their lead leg (i.e. lift their front foot) over the hurdle. According to the law of conservation of momentum, in which direction is their upper body likely to rotatate?

    forwards, in the opposite direction to the leg being lifted