A classic vinyl record of radius 15 cm spins at a constant angular rate on a turntable
PHYSICS · Multi-part · AP · Physics 1: Algebra-based · Torque and Rotational Dynamics · Torque and Rotational Dynamics
Problem
A classic vinyl record of radius 15 cm spins at a constant angular rate on a turntable. Two tiny insects, A and B, ride on the surface of the record. Insect A is located 3.0 cm from the center, while insect B is 12 cm from the center.
(1) Describe qualitatively how the magnitude of the linear speed of a point on the record depends on its distance from the center when the record rotates at a fixed angular rate.
(2) Indicate which insect, A or B, has the greater linear speed and provide a clear physical explanation for your choice.
(3) Calculate the ratio vB/vA of the magnitudes of the insects’ linear speeds, showing all reasoning.