skater’s body has rotational inertia 4.2 kg m2with his fists held to his chest and 5.7 kg m2with his arms outstretched. He’s twirling at 3.1 rev/s while holding 2.5-kg weights in each outstretched hand; the weights are 76 cm from his rotation axis. If he pulls his hands to his chest, so the weightsare essentially at his rotation axis, how fast will he be rotating?
Angular speed, acceleration and displacement
Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.
Angular Position
Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.
A skater’s body has rotational inertia 4.2 kg m2with his fists held to his chest and 5.7 kg m2with his arms outstretched. He’s twirling at 3.1 rev/s while holding 2.5-kg weights in each outstretched hand; the weights are 76 cm from his rotation axis. If he pulls his hands to his chest, so the weightsare essentially at his rotation axis, how fast will he be rotating?
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