An ice- skater is initially spinning at an angular speed ω = 1.35 revolutions/s with a rotational inertia Ii = 2.30 kg.m2 with her arms extended. When she pulls her arms in, her rotational inertia is reduced to If=1.05 kg.m2 . Assume no external torques act.
a) Determine her initial angular speed in rad/s. (1 marks)
b) Calculate her final angular speed in RPM (4 marks)
c) Calculate the period of rotation when she is at her final speed (1 mark)
d) Prove that rotational kinetic energy was NOT conserved during the process. (3 marks)
e) Where did the extra rotational kinetic energy come from? (1 mark)
Concept - use work energy theorem to find the work done to change the velocity as shown below,
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An ice- skater is initially spinning at an angular speed ω = 1.35 revolutions/s with a...
An ice- skater is initially spinning at an angular speed ω = 1.35 revolutions/s with a rotational inertia Ii = 2.30 kg.m2 with her arms extended. When she pulls her arms in, her rotational inertia is reduced to If=1.05 kg.m2 . Assume no external torques act. a) Determine her initial angular speed in rad/s. (1 marks) b) Calculate her final angular speed in RPM (4 marks) c) Calculate the period of rotation when she is at her final speed (1...
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