AP Physics C: Mechanics
6.4 Conservation of Angular Momentum
6.1 Rotational Kinetic Energy
A uniform spherical star of mass \(M\) and initial radius \(R_0\) rotates with angular speed \(\omega_0\). The star undergoes gravitational collapse, shrinking uniformly to a final radius \(R_f = \dfrac{R_0}{n}\) (where \(n > 1\)) with no change in mass or spherical shape. Assuming no external torques act on the star, what is the ratio of the star's final rotational kinetic energy to its initial rotational kinetic energy, \(\dfrac{K_f}{K_i}\)?
Similar Questions
Tools for a 5
AP aligned mock tests to help you get a 5.
With grading, adaptive explanations, and more.
Find a Quiz
Find, solve, and grade every AP FRQ ever.
Find an FRQ
Stuck on AP Physics C: Mechanics? Get unstuck with an AP specialist.1 to 1 tutors who know the exam inside out. Understand weeks of material in a single session.Find a Tutor
Learn AP Physics from scratch, quickly. This is the only course you'll need for the year.
A self-paced course with everything you need to get a 5. Trusted by over 15,000 students and 200+ schools. Learn fast, or we'll refund your purchase, backed by our 100% satisfaction guarantee.
Explore the Course