Problem 9: The rotational inertia of a collapsing spinning star drops from an initial value I= 9 x 109 kg m² to a value of I, = 3 x 109 kg m². (a) Ratio of final rotational kinetic energy (KE,) to the initial rotational KE, is (b) What would that ratio be if I/I=1/4?.
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.
Problem 9: The rotational inertia of a collapsing spinning star drops from an initial value Ii= 9 x 10^99 kg m2 to a value of If = 3 x 1099 kg m2.
(a) Ratio of final rotational kinetic energy (KEf) to the initial rotational KEi is ________
(b) What would that ratio be if If/Ii=1/4? ________
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