A circular bird feeder 19 cm in radius has rotational inertia 0.12 kg∙m2 . It’s suspended by a thin wire and is spinning slowly at 5.6 rpm. A 140‐g bird lands on the feeder’s rim, coming in tangent to the rim at 1.1 m/s in a direction opposite the feeder’s rotation. What’s the rotation rate after the bird lands?
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 circular bird feeder 19 cm in radius has rotational inertia 0.12 kg∙m2 . It’s suspended by a thin wire and is spinning slowly at 5.6 rpm. A 140‐g bird lands on the feeder’s rim, coming in tangent to the rim at 1.1 m/s in a direction opposite the feeder’s rotation. What’s the rotation rate after the bird lands?
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